question stringlengths 37 38.8k | group_id stringlengths 2 6 | sentence_embeddings listlengths 768 768 |
|---|---|---|
<p>I am trying to analyze data to predict the effect of 8 predictors on a response variable. I ant to do it using R.
There are 8 predictor variables (x1, x2, ..., x8) and one response variable (y).</p>
<p>I would like to find out which predictors have the largest influence on the response variable.</p>
<p>I have alre... | g62257 | [
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<p>I'm trying to compare two samples from multivariate normal distributions to see if their distributions are equivalent (within a factor of epsilon).</p>
<p>The standard version of this test is the <a href="http://en.wikipedia.org/wiki/Energy_distance#Testing_for_equal_distributions" rel="nofollow">energy test</a>, b... | g38313 | [
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<p>I would like to compare group means among 4 groups and analyse changes in their characteristics over time. I have a panel data set which is unbalanced. My sample sizes are not equal and therefore violate the assumptions of a mixed model anova? Any suggestions on how I can proceed?</p>
<p>Also I wanted confirmation... | g62258 | [
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<p>I am using the R programming language to analyze the cointegration of 5 data sets. I have determined that the series share 3 cointegrating vectors after taking structural shits into account following the approach of Lutkepohl et al (2004).</p>
<p>My questions are:</p>
<ol>
<li>How can I incorporate the 3 vectors i... | g38243 | [
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<p>I have what I hope should be a relatively quick and easy to answer question.</p>
<p>Would it ever make sense to replace the probabilities by an objective function within the relative entropy formulation?</p>
<p>I imagine a form of robust decision making under which a decision maker wishes to choose some value $s$ ... | g62259 | [
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<p>I have the following linear model with 2 predictors $x_1, x_2$ and a cubic transform on $x_1$:
$$
\hat{Y} = c +\beta_1x_1 + \beta_2x_1^2 + \beta_3x_1^3 + \beta_4x_2
$$</p>
<p>Where $x_1$ can assume negative values. I ran several regressions on subsets of the original population based on the absolute value of $x_1... | g62260 | [
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<p>I have a set of numbers (number of publications for each year of one person). I don't know the exact distribution. Now I also have another set of numbers to compare that to (number of publications for each year of the same person during another time period).
I'm interested whether the person has a higher publishing ... | g62261 | [
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<p>I have two linear regression parameters of interest, b1 and b2. Both parameters are from a linear model built from 14 datapoints and having 7 model parameters, including an intercept.
Interest lies in testing the null hypothesis b2 - b1 = 0 versus its two-sided alternative.</p>
<p>I have two questions concerning th... | g62262 | [
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<p>The usual pictures we see when dealing with different loss functions look similar to this:</p>
<p><img src="http://learning.cis.upenn.edu/cis520_fall2009/uploads/Lectures/hinge-exp-logistic-bounds.png" alt="losses"></p>
<p>Here we see y*f(x) on the x-axis with an error associated with it.</p>
<p>Suppose I have a ... | g19264 | [
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<p>As part of a broader study I am analysing 30 websites that fall into 3 categories:</p>
<ul>
<li>Consumer (10 sites)</li>
<li>Commercial (10 sites)</li>
<li>Health (10 sites)</li>
</ul>
<p>The approach I used was a 'tick and flick' spreadsheet with 24 dichotomous variables that represent features of the website tha... | g62263 | [
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<p>The question is to fill out the missing numbers (A-L) of a simple linear regression model.
I am having problems with converting and interpreting the given table in terms of variables. Would it be possible for someone to confirm and clarify things for me.</p>
<p>The first table represents regression statistics</p>
... | g62264 | [
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<p>What are the scenarios where Lasso is likely to perform better than Elastic Net (out of sample prediction)?</p> | g19267 | [
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<p>The question is related to <a href="http://stats.stackexchange.com/questions/73486/non-stationary-series-keep-close-to-each-other-but-correlation-between-growth-ra">this one</a>.</p>
<p>In <a href="http://stats.stackexchange.com/questions/8161/testing-two-i1-vectors-for-a-relationship?rq=1">this question</a> @mpikt... | g62265 | [
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<blockquote>
<p>Let $X$ be a discrete uniform random variable on the set $\{000, 011, 101, 110\}$ of four binary integers, and let $X_{i}$ denote the ith digit of $X$, for $i = 1, 2, 3$. Show that $X_{1}, X_{2}, X_{3}$ are independent pairwise, but not totally independent.
Can you generalize this example to more th... | g62266 | [
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<p>I have data from a experiment that has been repeated 3 times under the same condition. Each time, 5 measurements of each of 2 groups (a control and a treatment) were taken. I want to run a t-test on my data, to infer if there's a signification difference between the control and the treated group. </p>
<ul>
<li>H... | g37441 | [
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<p>I'm doing sme test using R and linear models.</p>
<p>This is the code I'm using:</p>
<pre><code>> a
[1] 0.10 0.05 0.02 0.04 0.09 0.05
> b
[1] 0.07 0.02 0.08 0.02 0.01 0.06
> c
[1] 0.03 0.03 0.01 0.05 0.06 0.09
>
> r.a
[1] 0.10 0.15 0.17 0.21 0.30 0.35
> r.b
[1] 0.07 0.09 0.17 0.19 0.20 0.26
>... | g62267 | [
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<p>Please give me mathematical explanation if possible. And also in the book Kothari 2004, it says:</p>
<blockquote>
<p>There is also not as much information in ‘n’ observations within a cluster as there happens to be in ‘n’ randomly drawn observations.</p>
</blockquote>
<p>Can you also give me mathematical explana... | g62268 | [
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<p>I'm trying to find similarities in 3-dimensional sequential data.
The sequences are 3-uples $(t,r,d)$ each sequence is generated by one subject during a 3-6 months period:</p>
<ul>
<li>$t$ is a task identification ranging from 1 to 50,</li>
<li>$r$ is the result obtained by the subject in the execution of the task... | g62269 | [
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<p>If I remove a variable from a regression model that is said in R to not be significant and re-run the regression a variable that was quite significant is no longer and another has become more significant. What could be possible reasons?</p> | g49359 | [
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<p>Our customers are Merchants and use our online payment service.</p>
<p>Before they started using our service, they indicated how much $ transaction volume they will make per year. However this turned out to be only 50% true. We have categories:</p>
<pre><code>A customer: high volume ($1.000k <)
B customer: medi... | g62270 | [
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<blockquote>
<p><strong>Possible Duplicate:</strong><br>
<a href="http://stats.stackexchange.com/questions/4700/what-is-the-difference-between-fixed-effect-random-effect-and-mixed-effect-mode">What is the difference between fixed effect, random effect and mixed effect models?</a> </p>
</blockquote>
<p>Is there ... | g49640 | [
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<p>I have a rather complicated decision analysis problem involving reliability testing and the logical approach (to me) seems to involve using MCMC to support a Bayesian analysis. However, it has been suggested that it would be more appropriate to use a bootstrapping approach. Could someone suggest a reference (or thr... | g19280 | [
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<p>This may be a silly question, but when running a <strong>repeated measure</strong> GLM in SPSS, and entering syntax for means tables (/EMMEANS), is there any way to get that table to show not just the standard error, but the standard deviations as well, for all cells and interactions?
I need to report the standard d... | g62271 | [
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<p>This is almost dumb and a little embarassing, but I can't figure out how to (or even whether it is possible) to use the <a href="http://cran.r-project.org/web/packages/plm/index.html" rel="nofollow">plm</a> package in R to run a regression including fixed-effects that do not correspond to the individual observation ... | g62272 | [
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<p>I have a data set of 91 variables. It is related to a qualitative analysis I made to analyse a few phenomena. For this reason, the questions are grouped in 10 clusters, since they express different aspects of the analysis. </p>
<p>I made a subset using the following R command:</p>
<pre><code>example1<- subset(d... | g37430 | [
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<p>I want to make a nested logistic regression in R with the package <a href="http://cran.r-project.org/web/packages/mlogit/index.html" rel="nofollow">mlogit</a>.</p>
<p>I would like to test how producer's decision to enter organisations (14 organisations) or not is affected by different factors.</p>
<p>Producer can ... | g37660 | [
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<p>I've seen the homoskedasticity assumption stated as the constant conditional variance of the <strong>error</strong> (i.e., <strong>Var(u|x)=constant</strong>). </p>
<p>I was wondering if I can also state the homoeskedasticity assumption as constant variance across values of a same dependent variable, <strong>condit... | g49804 | [
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<p>I've been using iteratively reweighted least squares (IRLS) to minimize functions of the following form,</p>
<p>$J(m) = \sum_{i=1}^{N} \rho \left(\left| x_i - m \right|\right)$</p>
<p>where $N$ is the number of instances of $x_i \in \mathbb{R}$, $m \in \mathbb{R}$ is the robust estimate that I want, and $\rho$ is ... | g62273 | [
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<p>Wondering if there is an established result for the convergence rate when solving L1 regularized optimization via coordinate descent with tiny step? By "tiny step" I mean the step is always set to a very small positive constant, involving none of those step selection technique.</p> | g19283 | [
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<p>Consider interactions between members of two distinct groups. If one group has substantially fewer members than the other, then interactions between that group and the larger group will be naturally more frequent than interactions between two members of that same group.</p>
<p>Is there a way to take this into accou... | g62274 | [
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... |
<p>I'm studying regressions. I was asked to write graphical and numerical summaries of the distribution of four variables and their relationships. What is a proper way to do it say for example in R? The data points are of the form $(x_i,y_i,z_i,t_i)$ where $0.5<x_i<35,\quad 0.3<y_i<14,\quad 0<z_i<9.15... | g47257 | [
0.06088109686970711,
-0.03590923920273781,
-0.030454684048891068,
-0.07382360845804214,
-0.013483628630638123,
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0.04968027397990227,
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0.015891630202531815,
0.0008708902751095593,
0.0313551090657711,
0.015... |
<p>$R^2$ measures explained variance. In an autoregressive model like <code>AR(k)</code>, we are carrying out a linear regression, and as such we would have an $R^2$ and an adjusted $R^2$. Why are they not used in practice?</p> | g19284 | [
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<p>I have 11 scale parameters for each of 218 observations belonging to subjects, I did standardized PCA to reduce dimensionality of the data and found two meaningful components. Using Euclidean distances this was followed by cluster analysis of these two components (explaining about 75% of the variance) with bottom-up... | g1505 | [
0.01819487102329731,
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<p>I have a couple of stacked histograms which I need to compare/evaluate for similarity or difference.</p>
<p><img src="http://i.stack.imgur.com/JK2GG.png" alt="Stacked histogram generated from one dataset"></p>
<p>I believe rather than evaluating histograms is will be east to work with dataset used to plot these st... | g62275 | [
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<p>My team and me would like to give a presentation to the non-statisticians of the company about the utility of the design of experiments. These non-statisticians are also our clients and they usually don't consult us before collecting their data. Do you know some real examples which would well illustrate Fisher's fam... | g19285 | [
0.003204959211871028,
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<p>I have several populations with a large n (100,000 - 1M+ samples), which i wish to compare.</p>
<p>I know that virtually any statistical test i apply will reject the null hypothesis due to the extreme power of the statistical tests to resolve small differences. </p>
<p>I am able to work around this when comparing ... | g62276 | [
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0.00032219456625171006,
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0.018191559240221... |
<p>if I have a table like this</p>
<p><img src="http://i.stack.imgur.com/ee6p8.png" alt="enter image description here"></p>
<p>In which,</p>
<p>site = different sites of measurement (tissue or organ)</p>
<p>type = different types of virus</p>
<p>And I want to ask something about the data</p>
<p>1.What test can I ... | g62277 | [
0.03209568187594414,
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0.017015431076288223,
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0.04082557559013367,
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-0.009626541286706924,
0.03575689718127251,
0.05342140421271324,
0.009478563442826271,
0.00956... |
<p>I have one dependent variable and am trying to see if any of my 12 independent variables correlate with it, however I need to check everything for normality.</p>
<p>I understand I need to look at skewness and kurtosis. Does the formula look like the following:
skewness score subtracted by mean of condition divided ... | g62278 | [
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0.025409003719687462,
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... |
<p>Assume we have $n$ points in a rectangular with bound $[0,a] \times [0,b]$, and these points are uniformly distributed in this plane. (I am not quite familiar with statistics, so I don't know the difference between uniformly pick a node in the area $[0,a] \times [0,b]$, or uniformly pick $x$-axis from $[0,a]$ and $y... | g62279 | [
0.004576696548610926,
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0.05865347757935524,
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0.015733107924461365,
-0.02694887295365333... |
<p>I am having a conceptual hard time understanding where this formula came from. It does not seem to make any sense to me. Could someone shed some light on this:</p>
<blockquote>
<p>The natural estimator of $p$ is $\hat p = \frac{X}{n}$, the same fraction
of success. Since $\hat p$ is just $X$ multiplied by a con... | g19288 | [
-0.004765238147228956,
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0.09981200098991394,
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0.0211517084389925,
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0.06821078807115555,
0.013840297237038612,
0.... |
<p>When evaluating an estimator in a frequentist setting, using MSE and let say to compute the Bias of the estimator we compute the expectation of this estimator, are we supposing that the estimator has a probability distribution? doesn't this contradict the frequentist argument that a parameter is not a random variabl... | g38290 | [
0.023889612406492233,
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0.0008526991005055606,
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0.0686730146408081,
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-0.003892956767231226,
0.036127906292676926,
0.006288962904363871,
0.02250882424414158,
0.0... |
<p>After reading <a href="http://www.evanmiller.org/how-not-to-sort-by-average-rating.html" rel="nofollow">How Not To Sort By Average Rating</a> which deals with confidence interval for a Bernoulli parameter how would you extend it to more than two levels?</p>
<p>For example: Items are scored between 1 and 5 (1 is wor... | g19289 | [
0.01309945434331894,
0.05112459883093834,
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0.029847413301467896,
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0.008624103851616383,
0.039005160331726074,
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-0.0011829633731395006,
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-0.02057310938835144,
0.03162430599331856,
0.... |
<p>I want to draw a graph of sales over time. However, the time periods I have available to me overlap. For example:</p>
<ul>
<li>January 2012 to January 2013: 10 million </li>
<li>April 2012 to April 2013: 12 million </li>
<li>July 2012 to July 2013: 14 million </li>
<li>October 2012 to October 2013: 12 million</li>... | g3969 | [
0.015262690372765064,
0.08314199000597,
0.008191547356545925,
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0.010866045020520687,
0.012519973330199718,
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0.030936624854803085,
0.09372122585773468,
-0.021933967247605324,
0.08030951768159866,
-0.008... |
<p>I'm wondering how I should do the following in SPSS.</p>
<p>I have a dataset with missing data (at random).
Some values are blank, because the question was "not applicable" to that person (eg. questions about walking asked to people in a wheelchair). I assume I shouldnt want those values filled in with Multiple Imp... | g62280 | [
0.05157971754670143,
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0.006087792571634054,
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0.04974526911973953,
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0.018915362656116486,
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-0.026706207543611526,
-0.000025222374461009167,
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0.05969729647040367,
0... |
<p>At the end of every semester I have to input my students' grades into a database. Typically this means I go one by one down my list of grades from my excel spreadsheet and manually fill the grade into the db application. One way to check I have done things correctly is to compare the mean and standard deviation of t... | g62281 | [
0.008089955896139145,
-0.026392566040158272,
-0.014181029051542282,
-0.052950337529182434,
-0.036957770586013794,
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0.012296349741518497,
0.002890934469178319,
-0.09601132571697235,
-0.0184437558054924,
0.018559090793132782,
-0.02200373448431492,
0.04917996749281883,
0... |
<p>Suppose I have two variables that measure some form of severity of illness on identical ordinal scale; one measured before treatment and the other measured after the treatment.</p>
<p>I want to test if there is an improvement between treatments.</p>
<p>Non-parametric correlations wouldn't be suitable; they would t... | g62282 | [
0.022692231461405754,
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-0.004059291910380125,
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0.006123423110693693,
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0.009459547698497772,
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-0.03802578151226044,
0.012556769885122776,
0.030322842299938202,
0.0010425981599837542,
-... |
<p>In ARMA (with normal errors) model estimation, are there any empirical studies or tests to judge the minimum number of observations (length) of the time series that are required such that OLS is an acceptable estimation of the model (in contrast to an exact likelihood)?</p> | g19293 | [
-0.0028481376357376575,
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0.00050618767272681,
0.017645463347434998,
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0.026721375063061714,
0.04559233412146568,
-0.023797903209924698,
0.04149765893816948,
0... |
<p>To me, it seems that Hold-out validation is useless. That is, splitting the original dataset into two-parts (training and testing) and using the testing score as a generalization measure, is somewhat useless. </p>
<p>K-Fold seems to give better approximations of generalization (as it trains and tests on every point... | g62283 | [
-0.0007555373595096171,
0.04470251500606537,
0.018421202898025513,
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0.04821708798408508,
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0.055626753717660904,
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-0.05667668581008911,
0.038454871624708176,
0.00749226612970233,
0.025969071313738823,
0.0... |
<p>In the book <a href="http://www.crcpress.com/product/isbn/9781584885740" rel="nofollow">Multiple Comparisons Using R</a> Bretz et al write that their R package <a href="http://cran.r-project.org/web/packages/multcomp/index.html" rel="nofollow">multcomp</a> improves power above other multiple comparison procedures by... | g62284 | [
0.03473725914955139,
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-0.006466840393841267,
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0.08194630593061447,
0.02725534699857235,
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-0.03149259090423584,
-0.0007779438747093081,
-0.042199473828077316,
0.008720160461962223,
... |
<p>From <a href="http://en.wikipedia.org/wiki/Nuisance_parameter" rel="nofollow">Wikipedia</a>:</p>
<blockquote>
<p>a nuisance parameter is any parameter which is not of immediate interest but <strong>which must be accounted for in the analysis of those parameters which are of interest</strong>. </p>
</blockquote>
... | g37539 | [
-0.01320782769471407,
0.007235295604914427,
0.0030893858056515455,
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0.0650155171751976,
0.007460373919457197,
0.019334835931658745,
0.0564851388335228,
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0.053014837205410004,
-0.07839114964008331,
0.012636279687285423,
0.05406089872121811,
0.042422... |
<p>I'm taking an intro to data visualization class, but I don't have a strong foundation in statistics.</p>
<p>For now I'm trying to do something basic with bar graphs.</p>
<p>I basically want to plot the median price of two types of products. I'm trying to see how much the condition of an item affects its price and ... | g62285 | [
-0.027426932007074356,
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0.06264911592006683,
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-0.03618906810879707,
0.04883485659956932,
0.05358624830842018,
0.05331723392009735,
-0... |
<p>I have a equation to solve $Ax = b$, where $A$ happens to be the precision matrix of a multivariate Gaussian distribution. I can use either direct solver or iterative solvers to get the $x$ vector. However, I also need to get the diagonal elements of the covariance matrix given by $A^{-1}$. I cannot directly invert ... | g39650 | [
-0.010033505037426949,
-0.040393270552158356,
-0.015261461958289146,
-0.07138560712337494,
0.006460082717239857,
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0.055110324174165726,
0.02106454223394394,
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0.014303646050393581,
0.00903067085891962,
0.045143939554691315,
0.010520391166210175,
-0... |
<p>Does "benchmarking" and "post-stratification" describe exactly the same process? The Wikipedia article on <a href="http://en.wikipedia.org/wiki/Statistical_benchmarking" rel="nofollow">Statistical Benchmarking</a> claims it is; however, the article on <a href="http://en.wikipedia.org/wiki/Sampling_%28statistics%29" ... | g38048 | [
0.06497105211019516,
-0.02628847025334835,
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0.023097224533557892,
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0.054285064339637756,
0.020484767854213715,
-0.01723058708012104,
-0.016475146636366844,
0.01711958833038807,
-0.037304386496543884,
0.005513815209269524,
-0... |
<p>I want to show that my data cannot fit a given distribution (in my case it's the Pareto type II distribution). I did a P-P plot, i.e on the y-axis I plot my sorted experimental data and on the x-axis the inverse of the theoretical cdf.
I added my Matlab code below in case my explanation is not clear. </p>
<p>Most ... | g62286 | [
0.03181146830320358,
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-0.050987642258405685,
-0.026066841557621956,
0.011236004531383514,
0.03853802755475044,... |
<p>Can somebody please share idea on how I can model a TAR model that can handle outliers in nonlinear data? I need to compare such model with the general form of TAR model. Which computer software can be applied? Thank you.</p> | g19299 | [
0.02501312457025051,
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0.030422944575548172,
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-0.012719321064651012,
0.037234388291835785,
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0.04047754779458046,
... |
<p>I'm using scikit learn's linear model to do <a href="http://scikit-learn.sourceforge.net/0.8/modules/generated/scikits.learn.linear_model.Ridge.html" rel="nofollow">ridge regression</a>.
Ridge regression penalizes parameters for moving away from zero. I want to penalize for moving away from a certain prior, with eac... | g62287 | [
-0.00832228921353817,
-0.04033725708723068,
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0.07894965261220932,
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0.018918635323643684,
0.022953160107135773,
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-0.014864776283502579,
0.005550586152821779,
0.03892452269792557,
0.05079368129372597,
0.01... |
<p>I have an urgent need to understand Latent Dirchlet Allocation (LDA) for Topic Modeling. I tried several sources, but it seems I do not have required knowledge to learn this.</p>
<p>My statistics knowledge is very limited. I know basic probability, conditional probability and a bit of probability distribution. </p>... | g3593 | [
0.04717664048075676,
0.028194813057780266,
0.014090328477323055,
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-0.04256526008248329,
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0.06178445369005203,
-0... |
<p>Say you have a set of data of lengths, widths, and heights of a rectangular box. Why do we have to use error propagation to calculate the std. dev. of the box's volume? Why couldn't we calculate the volume associated with each l/w/h datum, and take the std. dev. of that?</p> | g62288 | [
0.055567070841789246,
0.008676947094500065,
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0.008981715887784958,
0.08840017765760422,
... |
<p>Matrix equations of some sort or matrix decompositions often lie in foundation of many algorithms not only in data analysis but in many other fields. The wealth of already written libraries makes it tempting to formulate frequent itemsets mining problems in terms of said matrix equations and/or decompositions, yet a... | g62289 | [
0.005434811115264893,
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0.008427520282566547,
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0.00833430327475071,
-0.014037247747182846,
-0.0008922048145905137,
0.010215693153440952,
... |
<p>Regarding estimators of variance from a iid sample of size $n$, Karl Ove Hufthammer says <a href="http://stats.stackexchange.com/q/84116/1005">Estimates of variance from an iid sample</a>:</p>
<blockquote>
<p>if they do have a normal distribution, dividing by n+1 (sic!) will give the lowest mean square error. <... | g62290 | [
0.08427347987890244,
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0.019732370972633362,
0.042376648634672165,
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... |
<p>Reading <a href="http://www.geog.ucsb.edu/~joel/g210_w07/lecture_notes/lect01/oh07_01_2.html" rel="nofollow">this webpage</a>, I wonder:</p>
<ul>
<li><p>Are confirmatory analysis / statistics and inferential analysis / statistics the same concept?</p></li>
<li><p>Are exploratory analysis / statistics and descript... | g62291 | [
0.07728667557239532,
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-0.03392161801457405,
0.031849149614572525,
-0.0025893489364534616,
0.0630175918340683,
0.0184... |
<p>If we have the events: </p>
<ul>
<li>A is the number of rainfalls/month in a given period of time (rate of which is equal in each month)</li>
<li>B is the number of hailstorms/month in a given period of time (rate of which increases in winters)</li>
</ul>
<p>Can we statistically prove the probability of event A i... | g62292 | [
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0.01... |
<p>I have to run a test on a program, with some statistical tools to make sure its results are statistically acceptable. This program will take sequences of data information (a vector of integers or symbols with different length) and use some distance metrics (like <a href="http://en.wikipedia.org/wiki/Levenshtein_dist... | g62293 | [
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-0.0... |
<p>On an attempt to solve this <a href="http://cs.stackexchange.com/questions/1076/how-to-approach-vertical-sticks-challenge">problem</a> I've managed to reduce it to finding the expected number of white balls picked until one black ball is observed (let's call that value $v$). Except that, unlike the geometric distrib... | g62294 | [
0.04923374578356743,
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0.011982101015746593,
0.03754464164376259,
-0.0... |
<p>I have a CFA with four factors - they are all intercorrelated except for two. </p>
<p>Is this a problem for the model to have two factors uncorrelated?</p> | g19303 | [
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<p>I am interested in the Bayes risk of some distribution $\pi$
$$
r(\pi) = \mathbb{E}_{\pi(x)}[ \mathbb{E}_{\Pr(y|d,x)}[L(x,\hat x(y|d))]],
$$
where $L$ is some loss function and $\hat x$ is the posterior mean (here: Bayes estimator). Here $d$ is some experimental design parameter.</p>
<p>If $L(x,\hat x) = |x-\ha... | g38309 | [
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0.0001459356426494196,
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0.015301297418773174,
0.06899245083332062,
0.0620688833296299,
... |
<p>My understanding is 'no', a stationary process does not imply a normal distribution of the data. However I haven't found a clear indication in my library or online. I am interested in other resources comparing stationary and heteroscedastic processes to data distributions.</p>
<p>I understand a stationary process j... | g38310 | [
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... |
<p>This is a basic question on Box-Jenkins MA models. As I understand, an MA model is basically a linear regression of time-series values $Y$ against previous error terms $e_t,..., e_{t-n}$. That is, the observation $Y$ is first regressed against its previous values $Y_{t-1}, ..., Y_{t-n}$ and then one or more $Y - \ha... | g49904 | [
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0.011... |
<p>Suppose we have $\newcommand{\E}{\mathrm{Exp}} X \sim \E(\lambda)$, $Y \sim \E(\mu)$, and $W = \min(X,Y)$. </p>
<p>I know that $W \sim \E(\lambda+\mu)$. I know how to derive it. But, I tried this alternate derivation that gave me a different distribution for $W$, and I still can't figure out what's wrong with it.</... | g19306 | [
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0.0... |
<p>I am trying to come up with an easier algorithm than usual nonlinear optimization algorithms for linear support vector classifier.</p>
<p>My idea is </p>
<ol>
<li><p>Once classifier is determined, it's easy to decide support vectors (data misclassified + data near the discriminant plane) </p></li>
<li><p>Provided ... | g62295 | [
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0.030977971851825714,
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0.0609... |
<p>I've collected fluorescence data from some bacterial cells.</p>
<p>Each cell has a gene in it which can be induced to fluoresce. However, even without being induced, the gene will still fluoresce a little.</p>
<p>I have subjected the cells to a series of concentrations of inducer, including 0% inducer, and measure... | g62296 | [
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<p>Recently I obsessed about standardization of scores. I am looking into statistical literature to see if standardization of data is OK or not.</p>
<p>a brief about standardization:</p>
<p><a href="http://en.wikipedia.org/wiki/Standardizing" rel="nofollow">http://en.wikipedia.org/wiki/Standardizing</a></p>
<p>by do... | g62297 | [
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... |
<p>Well, I trying hard with this problem...but two of my answers are wrong. Please check it.</p>
<p>A painter has 4 benches to paint. He has paint of the following colours: RED, YELLOW, WHITE and BLACK. In how many ways can the benches be painted if
(a) he chooses the same colour
Answer 4</p>
<p>(b) at least one... | g62298 | [
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0.0... |
<p><strong>Hopefully this is now a much clearer picture of the question I want to answer:</strong></p>
<p>For each of 60 different plans I ran 35 simulation replications of my Agent Based Model (ABM) simulation. Then for each simulation replication of each plan, I generated a score ($\geq0$), so that I ended up with ... | g62299 | [
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... |
<p>Often I have found deep learning and <a href="http://www.ntu.edu.sg/home/egbhuang/pdf/ELM-NC-2006.pdf" rel="nofollow">extreme learning machine</a> discussed together.</p>
<p>Based on my little knowledge of the subject my impression is that they are different methods with different aims. </p>
<p>So what's the relat... | g62300 | [
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0.031259115785360336,
0.01590021327137947,
0.040699396282434464,
-0.... |
<p>I have a data set of videos from which I need to recognize the emotion of the speaker. For that reason I have some markers on the face of the speaker. I detect their movement as the speaker speaks and for every frame find the change in the marker coordinates.</p>
<p>There are a total of 65 markers (blue dots) on th... | g62301 | [
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0.023393915966153145,
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0.0... |
<p>I know normality assumption is not necessary for all of the ARIMA models. My question is that if we have a non-normal time series, is it better to transform it to normal state by transformations like Box-Cox and then use it in the model? what are the pros and cons of these transformation in ARIMA models?</p> | g62302 | [
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0.02462868206202984,
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<p>I'm Stata-proficient but learning SPSS for my new position. I am using a simple dataset to do very basic regressions and comparing to see if the results are the same. They're not. I'm close, but the magnitudes of the betas and significance are slightly different. The data was copy and pasted into each from an Excel;... | g19311 | [
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0.04388805478811264,
0.06471794098615646,
0.0... |
<p>In fitting a model with several variable I have found extremely useful a method involving the minimization of the Chi Square using a MCMC approach. In particular, I followed this tutorial <a href="http://sciencehouse.wordpress.com/2010/06/23/mcmc-and-fitting-models-to-data/" rel="nofollow">http://sciencehouse.wordpr... | g19313 | [
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0.03725985810160637,
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0.04590906202793121,
0.06... |
<p>I am having some difficulties interpreting the results of an analysis perfomed using lme. I conducted an experiment where the subjects had to estimate the time elapsed in a task involving a spatial measure (e.g. subjects watched a video game where a car travels a certain distance). My goal is to determine if there i... | g62303 | [
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... |
<p>I have recently come across a website (http://www.surveysystem.com/sscalc.htm) that returns the sample size given the following inputs: confidence level, confidence interval, and population. I assume this is done by rearranging a hypothesis test under a CDF, I guess using the standard normal distribution? But, if ... | g62304 | [
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0.0... |
<p>In the discussion : <a href="http://metaoptimize.com/qa/questions/4370/how-to-generate-a-roc-curve-for-binary-classification">how to generate a roc curve for binary classification</a>, I think that the confusion was that a "binary classifier" (which is any classifier that separates 2 classes) was for Yang what is ca... | g19315 | [
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<p><strong>Background</strong></p>
<p>I raised this question because of an argument I am having with a question from user697473 <a href="http://stats.stackexchange.com/questions/37422/formal-definition-of-random-assignment/37426#comment74194_37426">here</a>. The title of his question is "Formal definiton of random a... | g62305 | [
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0.025686753913760185,
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0.06492914259433746,
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0.007255980279296637,
... |
<p>I have a glm model for some data with a proportion as the outcome variable as follows:</p>
<pre><code>xi: glm pos_tests i.covariate_1 covariate_2 , family(binomial total_tests)
link(logit) vce(robust) eform
</code></pre>
<p>In this model, <code>pos_tests</code> is the number of positive laboratory results and <cod... | g37478 | [
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0.002781074261292815,
0.023578066378831863,
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0.03783072531223297,
-0.056... |
<p>I started to do Monte Carlo in R as a hobby, but eventually a financial analyst advised to migrate to Matlab.
I'm an experienced software developer.
but a Monte Carlo beginner.
I want to construct static models with sensitivity analysis, later dynamic models.
Need good libraries/ algorithms that guide me.</p>
<p>To... | g62306 | [
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0.02742961049079895,
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0.040364526212215424,
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0.012709127739071846,
-0.022849639877676964,
-0.0014948267489671707,
0.0515090748667717,
0.02... |
<p>I want to compare a parameter between two independent groups of volunteers (see MWE below). All volunteers had baseline reading (V1) and a subsequent reading by a later visit (V2) for intervention (<code>Interv</code>; Yes/No). The parameters are gene expression data and expressed in fold change (i.e. V2/V1). For br... | g1494 | [
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0.00327097880654037,
0.0763419046998024,
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-0.... |
<p>Given a model with two coponent expression:</p>
<p>$$G_R(w) = \frac{k^2 w^{2\alpha} + k w^{\alpha}cos(\frac{\alpha \pi}{2}) }{1+k^2 w^{2\alpha}+2 k w^{\alpha}cos(\frac{\alpha \pi}{2})}$$</p>
<p>$$G_I(w) = \frac{ k w^{\alpha}sin(\frac{\alpha \pi}{2}) }{1+k^2 w^{2\alpha}+2 k w^{\alpha}cos(\frac{\alpha \pi}{2})}$$</p... | g62307 | [
0.010292084887623787,
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0.01837710477411747,
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0.07392367720603943,
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-0.015676070004701614,
0.044112205505371094,
0.0... |
<p>On <a href="http://thequalityweb.com/measure3.html" rel="nofollow">this website</a> about statistical process control there is a chart which gives the upper and lower limits for the number of runs in a set of data for the data set to be considered taken from a process that is showing only "common cause" variation. M... | g19318 | [
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0.012256409041583538,
0.009667845442891121,
0.04560010880231857,
-0.002... |
<pre><code>Dependent Y R/E N W D98 CONSTANT
G 1.143 -O.656 1.029 0.173 0.104 17.31
(2.757) (-2.432) (1.896) (0.896) (2.126) (3.335)
Adjusted R-squared=0.59
F-statistic=3.218[0.045]
Jarque-bera statistic(with 8 degrees of ... | g62308 | [
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0.02391342632472515,
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0.0005118037224747241,
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0.007177489809691906,
0.09494590014219284,
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0.002109093591570854,
-0.03942054510116577,
-0.016515478491783142,
0.030337443575263023,
0.01... |
<p>I have programmed a logistic regression using the <a href="http://en.wikipedia.org/wiki/Iteratively_reweighted_least_squares" rel="nofollow">IRLS algorithm</a>. I would like to apply a <a href="http://en.wikipedia.org/wiki/Least_squares#LASSO_method" rel="nofollow">LASSO penalization</a> in order to automatically se... | g62309 | [
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0.09484370797872543,
0.08968176692724228,
0.03... |
<p>I wish to calculate the value on a normal distribution (having the mean and stdev), where P(Z >= ?) = 67%. </p>
<p>I'm new to stats, so in case my question is unclear, I will draw a picture:</p>
<p><img src="http://i.stack.imgur.com/xQqCm.png" alt="enter image description here"></p> | g19320 | [
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-0.0005486385198310018,
0.033699002116918564,
... |
<p>I have a binary variable (which takes values 0,1). I have about 100k records of it. How do I determine if it follows the binomial distribution?</p>
<p>(I'm bascially trying to test for normality. And, if the data is not normal, I might have to apply a transformation to get the variable into a binomial distribution.... | g62310 | [
-0.006879998836666346,
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... |
<p>I've got some data (158 cases) which was derived from a Likert scale answer to 21 questionnaire items. I really want/need to perform a regression analysis to see which items on the questionnaire predict the response to an overall item (satisfaction). The responses are not normally distributed (according to K-S tests... | g62311 | [
-0.020059090107679367,
-0.034010134637355804,
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0.0032223444432020187,
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... |
<p>While most of the tests for normality help for continous variables, is there a way to test the normality assumptions for binary variables. </p>
<p>From what i've read on wiki, the K-S test can be applied for continous variables. How do we perform normality tests for binary (or even categorical variables)?</p> | g62312 | [
0.025905683636665344,
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0.050... |
<p>I'm running a GLM model in R, but when I add additional variables, the degrees of freedom (df) for two of the variables (level and type, see models below) goes from 1 to 0, and because of this there is no information about them in either the Anova table or the summary output. Interactions involving these two variab... | g62313 | [
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... |
<p>I have two questions, </p>
<p>Question 1: How can I show that the posterior distribution is a beta distribution if the likelihood is binomial and the prior is a beta</p>
<p>Question 2: How does choices the prior parameters affect the posterior? Shouldn't they all be the same?</p>
<p>Is it possible to answers the... | g62314 | [
0.043853819370269775,
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0.01555971521884203,
0.01016371138393879,
0.04032869264483452,
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0.008555248379707336,
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0.002259876113384962,
-0.0299664456397295,
0.03190243989229202,
-0.019394386559724808,
0.02973... |
<p>I'm wondering if I could use an CLT theorem to show that </p>
<p>$S_n = \sum_{i=1}^n a_i X_i,$</p>
<p>converges to a normal distribution for large $n$, where $a_i$ are real constants and $X_i$ are I.I.D. poisson random variables. What are the conditions that this approximation is possible?</p>
<p>Thanks,
Smithy</... | g62315 | [
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0.013016322627663612,
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... |
<p>Is it possible to create a classification model which can predict continuous classes, like a number?</p>
<p>So far I've working with predictor which can predict one of two classes. I've searched about it and I just found references about continuous features.</p>
<p>I have a bunch of features (numbers) to predict a... | g62316 | [
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-0.... |
<p>I understand this question has been partly answered / discussed <a href="http://stats.stackexchange.com/questions/58242/why-are-maq-time-series-models-called-moving-averages">here</a> and I realize some authors do agree the terminology is confusing. But I still don't feel I have any intuition for how a <a href="http... | g49641 | [
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0.... |
<p>I am working on some more exam practice questions, and just want to see if I am approaching this question correctly?</p>
<p>Here is the complete question:</p>
<p>2,250 numbers are drawn at random without replacement from a barrel containing
150,000 ticket numbers. </p>
<p>After all the 2250 numbers are drawn, the... | g62317 | [
0.01543245930224657,
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0.0036104272585362196,
0.054364707320928574,
-0.0... |
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