question stringlengths 37 38.8k | group_id stringlengths 2 6 | sentence_embeddings listlengths 768 768 |
|---|---|---|
<p>I have elemental concentrations for 18 elements in 36 samples, determined by neutron activation analysis. I would like to calculate correlation coefficients, etc. by regression analysis according to the York method.</p> | g22958 | [
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<p>I'd be grateful for your help.
I have run a repeated measures ANOVA in SPSS.
I have two factors - I and II.
Factor I has 2 levels (a) and (b) and factor II has 3 levels (c) (d) and (e).</p>
<p>I have identified significant Main effects of Factor I and Factor II.
However, there is no significant interaction between ... | g64693 | [
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<p>Some guys told me that it's appropriate to use Wald-Wolfowitz Runs Test as a normality test (like Shapiro-Wilk's or Kolmogorov-Smirnov...). Do you think this is good way to test normality assumptions?</p> | g22959 | [
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<p>I have a bunch of raw data values that are dollar amounts and I want to find a confidence interval for a percentile of that data. Is there a formula for such a confidence interval?</p>
<p>Thanks for any help</p> | g64694 | [
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<p>I'm using a feed forward neural network to approximate a function with 24 inputs, and 3 outputs. Most of the literature suggests that a single layer neural network with a sufficient number of hidden neurons will provide a good approximation for most problems, and that adding a second or third layer yields little ben... | g64695 | [
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<p>When splitting the sample into segments, I would expect the likelihood of the segments to sum up to at least the likelihood of the full sample (constraining the parameters to be the same). Or did I misunderstand?</p>
<p>The code example is in <code>R</code>, using the <code>rugarch</code> package. The <code>rmgarch... | g64696 | [
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<p>For the selection of predictors in multivariate linear regression with $p$ suitable predictors, what methods are available to find an 'optimal' subset of the predictors without explicitly testing all $2^p$ subsets? In 'Applied Survival Analysis,' Hosmer & Lemeshow make reference to Kuk's method, but I cannot fin... | g22960 | [
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<p>I read a good <a href="http://www.wikihow.com/Calculate-P-Value" rel="nofollow">tutorial</a> on the p-value. Everything there is clear for me, except how I can define the null hypothesis. I found <a href="http://www.econ.upf.edu/~michael/stanford/maeb7.pdf" rel="nofollow">an example</a> (on page 6) in this paper us... | g64697 | [
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<p>I want to include the term $x$ and its square $x^2$ (predictor variables) into a regression because I assume that low values of $x$ have a positive effect on the dependent variable and high values have a negative effect. The $x^2$ should capture the effect of the higher values. I therefore expect that the coefficien... | g64698 | [
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<p>As someone who needs statistical knowledge but is not a formally trained statistician, I'd find it helpful to have a flowchart (or some kind of decision tree) to help me choose the correct approach to solve a particular problem (eg. "do you need this and know that and that and consider data to be normally distribute... | g42605 | [
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<p>I am trying to understand naive Bayes and its application to text classification.
I have a doubt or this may be my misconception. </p>
<p>Suppose we have two categories "News" and "Sports" in which we need to classify any given document. Let the dictionary contain only 3 keywords ${news,football,tennis}$ with the f... | g22971 | [
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<p>a recent posting on <a href="http://math.stackexchange.com/questions/5922/probability-of-card-decks-being-in-the-same-order-for-n-shufflers-over-x-amount-o">math.stackexchange</a> reminds me of a somewhat less ambitious$^1$ question i have been meaning to ask. </p>
<p>suppose 3 people each have a deck of $M$ cards ... | g64699 | [
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<p>I'd like to ensure that I understand the process correctly. This is a follow-up question to <a href="http://stats.stackexchange.com/questions/3270/interpreting-2d-correspondence-analysis-plots">http://stats.stackexchange.com/questions/3270/interpreting-2d-correspondence-analysis-plots</a> </p>
<pre><code>library(re... | g64700 | [
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<p>I'm not a statistician, but I sometimes need I play around with data. I have two data sets, lists of values in the unit interval. I've plotted them as histograms, so I have an intuitive idea of how "far apart" they are. But I want to something a little more formal.</p>
<p>My first thought was to just sum the the di... | g64701 | [
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<p>I am looking for books / textbooks on statistics based on fractal mathematics. I know it is not a very well known area and it is rather difficult to find good literature. Any suggestions are welcome (books, textbooks, online materials).</p> | g64702 | [
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<p>I ran an OLS regression, and the p-value of one variable is 0.065, which is more than the threshold to consider statistically significant. However, it's not too bad either, as my data has only 300+ data points. Therefore I think the explanation needs to be taken with a bit of salt.</p>
<p>How would you explain such... | g64703 | [
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<p>Isn't the equation derived using MLE a regression? Doesn't that allow for t and f test?</p>
<p>Please help, thanks.</p> | g30124 | [
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<p>I'm looking at a few logistic regression issues. ("regular" and "conditional").</p>
<p>Ideally, I'd like to weight each of the input cases so that the glm will focus more on predicting the higher weighted cases correctly at the expense of possibly misclassifying the lower weighted cases.</p>
<p>Surely this has be... | g64704 | [
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<p>I am studying interval estimation by the method of pivotal quantities.
Let $X_1,X_2,...,X_n$ be a random sample from a p.d.f $f(x;\lambda)=\lambda e^{-\lambda x}, x>0,\lambda >0$.<br>
I have to show that $2\lambda\sum X_i$ is a pivotal for estimating $\lambda$. </p>
<p>Since $X $~$ exp(\lambda) $, $\sum X_i... | g22978 | [
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<p>I want to graph some data, containing of an event ID and a date (minimum required resolution is one day). every event ID has multiple dates connected to it, so the min and max date give me a time span. Another useful information would be where in time most of these events took place (like a density graph over this t... | g22979 | [
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<p>I know I do not need to standardize the predictor variables before applying CART but would there be any adverse effects to doing it anyway? I'm comparing CART to a linear regression where I did standardize the inputs and for the sake of consistency I'd like to do the same for CART, but could it be detrimental to my ... | g64705 | [
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<p>I just saw <a href="http://www.xuru.org/rt/TOC.asp" rel="nofollow">this website</a>, that offers different online regression tools. For example it offers linear regression that creates a function in the form $y=ax+b$. Or it offers power regression that creates a function of the form $y=cx^a$. Or even it provides log... | g22980 | [
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<p>I'm doing Phillips-Ouliaris Cointegration test with po.test function inside tseries library.</p>
<p>I have a simple question about the "cointegration".</p>
<p>When i do PO test I get the p-value result but I don't get the "coefficients" of the cointegration. Is it normal? </p>
<p>I mean, the cointegration is used... | g38950 | [
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<p>My question is whether my data are a survival analysis problem.</p>
<p>I have 3 groups (2 interventions and 1 control). The 200 patients are <strong>all</strong> followed up for 6 months only. The follow-up is done by observing the records in a public hospital for any readmissions. I am making the assumption that a... | g22982 | [
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<p>I have a basic question. MLE/LMSSE is introduced as follows:
$$Y = H\theta + W$$
where $H$ is the linear model matrix, $W$ is measurement noise (let's assume it is normal so MLE = LMSSE). $\theta$ is the vector of parameters.</p>
<p>The ML estimate is well-known: $(H'H)^{-1}H'\bf{Y} = \widehat{\theta}\quad\quad$ ($... | g22983 | [
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<p>I have two continuous variables which I have data from a physics experiment.</p>
<p>I want to test for association between the two variables but without assuming a monotonic relationship. I also only have 6 data point each with a large error associated with it and want the test to take this into consideration.</p>
... | g22985 | [
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<p>I have 150 pictures that represent archeological signs and 5 categories to which they belong. These pictures have features like circularity, roughness and elongation that are expressed as continuous values, and other values like number of end points, number of contours, and angles between segments.</p>
<p>I have r... | g64706 | [
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<p>What does it actually imply when a 95% CI does not contain an estimate (coefficient or parameter). Is there some model assumption that has not been satisfied? Or it means something else? </p>
<p>I know when comparing two group means, if the 95% CI does not contain 0, we can conclude that two group means may be diff... | g45248 | [
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<p>I have a data set of <code>x,y,z</code> data and I'd like to do a bicubic interpolation. x and y are spatial coordinates and z is a temperature.</p>
<p>Below there are two images. The first one is a (gnuplot) plot of my dataset and the second one is an interpolated version (<code>set pm3d interpolate 10,10</code>).... | g64707 | [
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<p>I was recently told that it is not allowed to include static covariates in mixed effect models. I can believe that this could be true, however, when I have time series data, and season is a grouping factor, then the differences between the static covariates in the different seasons should be tested, or not? </p>
<p... | g64708 | [
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<p>What are some good ways of quantitatively characterizing the periodicity level of an approximately periodic $f(t), t \in \mathbb{R}$ signal?</p>
<p>I need this to tell if the output of some system is periodic or not, and to be able to decide the output of which system (out of a given set) is "more" periodic (approx... | g22993 | [
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... |
<p>As I understand it, Student's t will asymptotically approximate the Z statistic at sample sizes approaching infinity (see the infinite degrees of freedom row for degrees of freedom in most introductory statistics books). However, Z tests are applicable when populations are assessed in total. </p>
<p>Thus, when th... | g28967 | [
0.01319028064608574,
0.005812633316963911,
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0.028169894590973854,
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0.0... |
<p>I'm confronting something pretty weird. I've got a household-level dataset, and I want to calculate the correlation between a binary variable A (taking values yes (2) or no (1)) and whether the household is urban or rural (a dummy taking values 0 or 1). </p>
<p>I'm using Stata and the correlation I get is positive ... | g64709 | [
-0.0030545780900865793,
-0.04193263128399849,
0.003482081927359104,
-0.029159121215343475,
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0.022183867171406746,
0.026184214279055595,
0.... |
<p>After running a regression of the form <code>reg <- lm(y ~ x1 + x2, data=example)</code> on a dataset, I can get predicted values using </p>
<pre><code>predict(reg, example, interval="prediction", level=0.95)
</code></pre>
<p>I'm wondering what the predicted values actually refer to when I'm using the regressio... | g64710 | [
0.004617257043719292,
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0.058533187955617905,
0.03713773190975189,
-0.03... |
<p>Starting from an "a priori" set of models based on my knowledge about potential relations between my dependent variable and the independent variables considered, I use AIC to find best models. More specifically I calculate Akaike weights then Evidence Ratio (ER) and consider that models with a ER < 2 are equally ... | g786 | [
-0.007242031395435333,
-0.019369935616850853,
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0.05025666952133179,
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0.014006503857672215,
0.027184758335351944,
0.01... |
<p>I've got a supervised learning problem where I've got about 15 features, mostly numeric, and I'm mapping these to a set of 5-7classes. Using decision trees or forests, I'm able to get confusion matrices that I'm quite satisfied with, but I'm interested in seeing what the "top" rules RIPPER would find would be.</p>
... | g42628 | [
-0.059082191437482834,
0.032509904354810715,
-0.003603653283789754,
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0.006082501262426376,
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-0.006192838307470083,
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0.06309149414300919,
... |
<p>I am running a linear regression on daily price returns and I want to capture the interaction between subsequent returns:</p>
<p>$r_{t+1} = \alpha + \beta_1 r_t + \beta_2 r_{t-1} + \beta_3 r_t \cdot r_{t-1} + \epsilon$</p>
<p>Where $r$ is a geometric return ($p / p_{t-1}$). </p>
<p>Each coefficient is interperab... | g42796 | [
0.02895643189549446,
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0.029595568776130676,
0.021445518359541893,
-0.0324... |
<p>There is a betting game, which seems to have "positive sum" situations, and I'd like to find out the optimal strategy.</p>
<p>Multiple players place bets against the bank, for and bets that fit winning criteria earn players points of the game.
There are two sets of criteria:
The first: bet 1 point with 0.475 chance... | g64711 | [
0.03960302844643593,
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0.014861899428069592,
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0.006424990948289633,
... |
<p>In $\chi^2$ testing, what's the basis for using the square root of the expected counts as the standard deviations (i.e. the expected counts as the variances) of each of the normal distributions? The only thing I could find discussing this at all is <a href="http://www.physics.csbsju.edu/stats/chi-square.html" rel="n... | g22999 | [
0.05725666508078575,
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<p>I am but a humble developer, so please forgive if I butcher terminology of confuse concepts.</p>
<p>I am looking at designing a simple ranking of <strong>Average Internet Audience Rank</strong> based upon a bloggers audience size (Twitter/Tumblr/Facebook friends) and how many times their content has been shared (i.... | g23000 | [
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0.017018113285303116,
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<p>I am just beginng an investigation involving characterizing the dependence between two 1D stochastic point processes $x$, $y$. The natural approach seems to involve Ripley's K-function: </p>
<p>$$
K(t) = \frac{T}{n_xn_y} \sum_{i=1}^{n_x} \sum_{j=1}^{n_y} w(x_i,y_j) I[d(x_i,y_j)<t]
$$</p>
<p>where $n_x$ is the n... | g23001 | [
0.04768567904829979,
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0.002798034343868494,
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0.06520296633243561,
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0.05120973661541939,
0.05653766170144081,
0.050... |
<p>I am trying to figure out how to handle time series data.</p>
<p>Initially, I thought it was self-evident (for my purposes) to only allow non-overlapping data blocks. (I.e., non-overlapping, time wise.)</p>
<p>Then it occurred to me, what about leap seconds? There could be a leap second in there, making one of the... | g64712 | [
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0.0... |
<p>I am a software engineer looking to build an <a href="http://en.wikipedia.org/wiki/A/B_testing" rel="nofollow">A/B testing</a> tool. I don't have a solid stats background but have been doing quite a bit of reading over the last few days.</p>
<p>I am following the methodology described <a href="http://37signals.com/... | g23003 | [
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0.021575873717665672,
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0.04527859017252922,
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0.04920891672372818,
0.04... |
<p>I'm planning to combine several observational studies, some of which have produced odds ratios and some hazard ratios. How do I get the standard error from the odds ratio $1.57$ ($95\%$ CI: $1.08-2.27$) and the standard error from the hazard ratio $1.56$ ($95\%$ CI: $0.96-2.52$)?</p> | g46296 | [
0.03183958679437637,
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... |
<p>I would like to conduct an usability study to assess users' perceived satisfaction with a computer system. I know that there are many well-established questionnaires to carry out this assessment. Now I am wondering how I can determine the sample size to be used in my study.Is there a specific rule? </p> | g42641 | [
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0.014258146286010742,
0.035473644733428955,
0.0057121505960822105,
0.00772861298173666,
0.0... |
<p>My course textbook for statistics is the one by Levine and Smith. However, I find myself interested in the various probability distributions. The author simply states the $f_X(x)$ and derives $F_X(x)$ and gives an application. I was in the hunt of a good online (<em>FREE</em>) resource which talks about probability... | g64713 | [
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0.009709049947559834,
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0.08110595494508743,
... |
<p>I have a case study where a person should be located. We do not know where this person is, but we have some information.</p>
<p>The total story is basically about the person which is to be searched.</p>
<p>The informations we have are connected to a road, a house and a satelitte:</p>
<p>One part is:</p>
<blockqu... | g64714 | [
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0.06255623698234558,
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<p>I need some suggestions of general predicting practice in the following case: I have a dataset of debt observations; there are ~8 variables defining each debtor situation (debt details and person details), quantitative and qualitative. The Debt Management applied for each person <strong>a sequence of actions</strong... | g64715 | [
0.005383063107728958,
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0.02539069578051567,
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0... |
<p>I have a solar irradience data set that was generated from 45 independent stations within a square mile. The stations are more or less regularly spaced in a grid. The data are 1Hz and are all time-synced (in theory). Having all 45 stations gives us a good idea of what the sunlight is doing over this square mile for ... | g64716 | [
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0.05484534054994583,
0.08367205411195755,
0.04434772953391075,
0.0... |
<p>Consider the simple linear model:</p>
<p>$$\pmb{y}=X'\pmb{\beta}+\epsilon$$</p>
<p>where $\epsilon_i\sim\mathrm{i.i.d.}\;\mathcal{N}(0,\sigma^2)$ and
$X\in\mathbb{R}^{n\times p}$, $p\geq2$ and $X$ contains a column of
constants.</p>
<p>My question is, given $\mathrm{E}(X'X)$, $\beta$ and $\sigma$, is there a fo... | g48183 | [
-0.026602348312735558,
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0.02949942834675312,
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0.05866124853491783,
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... |
<p>Suppose I have the numbers below. Consider them as results of some measurement.</p>
<pre><code> 22.73 +2.15 -1.81
23.81 +1.77 -1.54
28.6 +11.4 -6.4
29.59 +8.58 -5.43
</code></pre>
<p>The numbers on the 2nd and 3rd columns are the errors associated to the values in
the 1st one.
I would like to know how... | g64717 | [
0.020097598433494568,
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0.05634409934282303,
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0.020644543692469597,
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0.017050305381417274,
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0.014245269820094109,
0.032922741025686264,
0.... |
<p>An average of $B$ binomial i.i.d. random variables, each with variance $\sigma^2,$ has variance $\frac{1}{B}\sigma^2.$</p>
<p>If the variables are simply i.d. (identically distributed, but not
necessarily independent) with positive pairwise correlation $\rho$, the variance
of the average is $$\rho\sigma^2 + \frac{... | g64718 | [
0.010505474172532558,
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0.05658493563532829,
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... |
<p>As far i understand the difference between <code>Risk factor</code> and <code>Prognostic factor</code> is :</p>
<p>Risk factor is the <code>cause</code> of a condition whereas Prognostic factor influences the outcome
who has the condition, like resectability of tumour for lung cancer.</p>
<p>Is that the case ?</p>... | g64719 | [
0.0238336231559515,
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0.024210842326283455,
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0.0684252604842186,
-0.009569... |
<p>My problem deals in particular with time-series data about server performance, but the solution is sure to be applicable to many types of data sets. Pardon me if the answer is well-known; I don't know the right vocabulary to effectively search for these things.</p>
<p>Suppose I have two sets of time-series observat... | g64720 | [
0.05007941648364067,
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0.017515836283564568,
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0.014740273356437683,
0.016390947625041008,
... |
<p>I've been trying to analyze some data using mixed models but I have some troubles to understand how should I include both within-subject and between-subject fixed effects in such models.</p>
<p>Let's consider a following theoretical example in which I have pupils nested within schools. I want to analyze the effect ... | g28731 | [
0.001828250358812511,
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0.014273988083004951,
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0.015953462570905685,
0.01163898129016161,
0.036865219473838806,
0.016519824042916298,
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0.011413770727813244,
-0.00668342923745513,
0.026047363877296448,
0.0... |
<p>After some searching, I find very little on the incorporation of observation weights/measurement errors into principal components analysis. What I do find tends to rely on iterative approaches to include weightings (e.g., <a href="http://arxiv.org/pdf/astro-ph/0502056v1.pdf" rel="nofollow">here</a>). My question is ... | g23008 | [
0.008511412888765335,
-0.014687757939100266,
-0.016677670180797577,
-0.07621908187866211,
0.03583807498216629,
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0.09059581905603409,
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0.011256018653512001,
0.051038339734077454,
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0.03808638080954552,
0.087... |
<p>I ran <code>simpleKmeans</code> clustering in weka version 3.4. I used <code>k=10</code> and <code>seed=10</code>.
The output only shows me the sum of squared error and cluster numbers and some stats that tell me how many data points fall under a cluster. Is there a way to retrieve what data points fell under a par... | g49705 | [
0.035773832350969315,
-0.021047912538051605,
-0.0164636317640543,
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0.0070237936452031136,
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0.010670581832528114,
0.02866368182003498,
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-0.0269254669547081,
-0.02913489006459713,
0.02287459373474121,
0.11412347108125687,
0.04835... |
<p>Anyone know how glmmADMB calculates log-likelihood and negative binomial zero inflated distribution?</p>
<p>I compared a model using glmmADMB and pscl and the diference in AIC and parameters are huge. I don´t know why. HELP. </p> | g64721 | [
0.03373384848237038,
-0.016579944640398026,
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0.026233429089188576,
0.00005483316635945812,
0.03551880642771721,
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0.02024097368121147,
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-0.0041746776551008224,
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0.034395527094602585,
0.07749395072460175,
-... |
<p>I had a discussion with a statistician back in 2009 where he stated that the exact value of a p-value is irrelevant: the only thing that is important is whether it is significant or not. I.e. one result cannot be more significant than another; your samples for example, either come from the same population or don't.<... | g23013 | [
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0.03644576668739319,
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0.022238856181502342,
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0.03562659025192261,
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0.024953167885541916,
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0.05218915268778801,
0... |
<p>My aim relates to the project described <a href="http://stats.stackexchange.com/questions/47190/basic-bayesian-mcmc-to-estimate-two-parameters-from-binomial-distributions-given">here</a>, but I've tried to make this question self-contained.</p>
<p>I'm trying to write the MCMC pseudocode for the following inference ... | g64722 | [
0.015369906090199947,
-0.02116507478058338,
0.012197026051580906,
-0.05063570663332939,
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0.021229282021522522,
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-0.02048160694539547,
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0.03796582296490669,
0.017167167738080025,
-0.00... |
<p>I am applying glm on a data in which most of the values are NAs or blank. For example, in the example data produced below (4 predictors and one response variable), the default glm command will remove 10 rows that contain 'NA' leaving just one row for analysis. This creates serious problem as some of my data that ini... | g23014 | [
0.060912057757377625,
0.010672063566744328,
0.003906264901161194,
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0.005146217532455921,
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0.03172015771269798,
0.039188072085380554,
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-0.00540874944999814,
0.046027250587940216,
0.01404733955860138,
0.02986881136894226,
0.01487... |
<p>I am implementing my own Random (regression) Forest algorithm and am looking for tricks to speed up the estimation of forests on large datasets.</p>
<p>So far I have implemented three main tricks:</p>
<p>1) Use a running variance on the sorted response vector to efficiently determine the optimal split point (for r... | g64723 | [
0.014477989636361599,
-0.001922618830576539,
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0.01562659814953804,
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0.0... |
<p>I have a simple question regarding the use of paired t-test and two-sample t-test:</p>
<ol>
<li>What is the consequence of using the independent two-sample t-test for dependent paired samples?</li>
<li>What is the consequence of using the paired t-test for independent samples?</li>
</ol>
<p>Thanks!</p> | g64724 | [
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<p>I want to ask regarding non-response bias. I have sent my questionnaire on-line to SMEs in Malaysia. However, I have sent reminders many times (around 5 times). However, now I cannot recall when the reminders were taken place as my account has been cancelled on the on-line questionnaire system. However, based on my ... | g64725 | [
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<p>I am writing a dissertation in which I use maximum likelihood estimation and an alternative Bayesian approach. I have written up the maximum likelihood estimation approach. However, I need some advice on presenting the Bayesian part. Can someone suggest me a source which can shape my thoughts so that I can write up ... | g64726 | [
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<p>What is the best book to learn probability - Poisson, binomial, regression, etc.</p>
<p>I am working as an odds adjuster at a bookmaker and need to advance my skills to an odds compiler level.</p> | g49347 | [
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<p>Does it make sense to do PCA before carrying out a Random Forest Classification?</p>
<p>I'm dealing with high dimensional text data, and I want to do feature reduction to help avoid the curse of dimensionality, but don't Random Forests already to some sort of dimension reduction?</p> | g42658 | [
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<p>I am a little bit rusty at this sort of thing, so I will not be offended if you tell me this is a stupid question. I am doing a logistic regression where my dependent variable is whether or not a person owns a particular product.</p>
<p>Among the variables in the model is an indicator of marital status, 1 for marri... | g42659 | [
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<p>How can I test effects in a Split-Plot ANOVA using suitable model comparisons for use with the <code>X</code> and <code>M</code> arguments of <code>anova.mlm()</code> in R? I'm familiar with <code>?anova.mlm</code> and Dalgaard (2007)[1]. Unfortunately it only brushes Split-Plot Designs. Doing this in a fully random... | g64727 | [
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<p>I am looking for the bayesian counterpart of the two-sample t-test with unequal variances (the Welch test). I am also looking for a multivariate test, like Hotelling's T statistic. References appreciated.</p>
<p>For the multivariate case, suppose that we have $(y_1,\cdots,y_N)$ and $(z_1,\cdots,z_N)$, where $y_i$ (... | g64728 | [
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<p>I've got a spreadsheet of some team scores. First team to 10 points wins. There are 2 players on each team. The players play with different teammates all the time, although they are not chosen perfectly randomly. No individual scores are kept.</p>
<p>So basically we have
Bill and Bob beat Andy and Alice 10-4
Jake a... | g23203 | [
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<p>I have been asked to use protected paired samples t-tests in an analysis. The requester states that if I do not use the overall MSe from my (1 factor with four levels) within-subjects ANOVA when conducting my paired samples t-tests there is not really any protection from the ANOVA.</p>
<p>As I remember it, in a be... | g23204 | [
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<p>I am building a predictive model (binary target variable) in the financial services industry. One of the (many) potential predictors I am adding to the model is related to the customers checking account balance trend (longitudinal balance).</p>
<p>I'd like to capture if the balance is increasing or decreasing and h... | g23021 | [
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<p>I am currently doing a study into factors that affect mortality in a particular type of bacterial infection.</p>
<p>I would like to compare certain patient characteristics. One of which is the specialty that the patient is under. I currently have a variable in SPSS that has three values according to the three speci... | g64729 | [
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<p>When I started with ANN I thought I'd have to fight overfitting as the main problem. But in practice I can't even get my NN to pass the 20% error rate barrier. I can't even nearly beat my score on random forest!</p>
<p>I'm seeking some very general or not so general advice on what should one do to make his NN start... | g64730 | [
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<p>I need to apply some basic stats to see if there are significant differences in total abundances of these three communities (X, Y and Z) with duplicate counts at three different locations (A, B and C). </p>
<p>Please do suggest best statistical test and how to apply.</p>
<pre><code> Replicates Location... | g23024 | [
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0.03923408314585686,
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0.00509892962872982,
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0.0... |
<p>I need to calculate the difference between six time series in three ways:</p>
<ul>
<li>Time Series are: Kamel, Dumper, Graben, Traktor, Generator </li>
<li>Methods are: Euclidean distance, Manhattan distance and maximum distance</li>
</ul>
<p>For example, I show the differences between these time series for Euclid... | g64731 | [
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... |
<p>I have a dataset of tweets collected using twitter streaming API on a particular topic (say 'football') using around 40 keywords. Now if I'm going to track the same topic (football) in future how do I determine the best set of keywords to query. Any researchers working on these areas? How do I solve this keyword amb... | g35018 | [
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<p>I want to test for the effect of interaction between two variables using a repeated measures logistic regression but I don't know how.</p>
<p>I am using Stata and the following lines:</p>
<pre><code>xtset participant
xtgee FIRST_VAR SECOND_VAR, fam(binomial) link(logit)
</code></pre> | g64732 | [
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<p>I have a multiple sequence alignment that I'm using to construct a phylogenetic tree. Usually, phylogenetic trees are constructed under the assumption that the input sequences are all from the present day -- thus, it forces them all to be leaf nodes.</p>
<p>However, my problem is a bit different. I have genome sequ... | g64733 | [
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<p>I am working on an <a href="http://meta.boardgames.stackexchange.com/questions/1085/should-i-ask-a-new-uno-question-and-if-so-how-should-it-be-worded">UNO Simulator</a> to measure the effectiveness of different strategies on an players win percentage.</p>
<p>I would like to know the proper way of expressing the res... | g64734 | [
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<p>There are four different types of mobile phones (same brand) that are used as stimuli in an experiment.</p>
<ul>
<li>In the first example, if "mobile phone" is the independent variable
in the study, which one of the two is appropriate? (i) mobile phone
is the independent variable with four levels or (ii) this stud... | g64735 | [
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0... |
<p>Can anyone explain to me the difference between penalised likelihood and maximum a posteriori?</p>
<p>I read a paper where the likelihood function is</p>
<p>$$L(\theta_1, \theta_2,\theta_3 ; x)=f(x|\theta_1, \theta_2) f(\theta_2|\theta_1,\theta_3)f(\theta_3)$$
or
$$\ell(\theta_1, \theta_2,\theta_3 ; x)=\log(f(x|\t... | g64736 | [
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<p>Let $X_1,...,X_n$ be a random sample from a $\mathcal{N}(\mu,1)$ distribution. Only the largest observation $Y = \max(X_1,...,X_n)$ is reported.</p>
<p>What is the density of $Y$? How do I get there?</p> | g49706 | [
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<p>I've implemented a backend which expose a rest API and it's now running on my own server.</p>
<p>I know it will be used by 5 groups of 20 users. Each group will use the server for 2 hours a week. If a group starts working, all the users will work at the same time, and for the following 2 hours, on the server. The c... | g64737 | [
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<p>I am trying to implement the .632+ bootstrap estimator for internal validation as proposed by <a href="http://www.stat.washington.edu/~ebfox/courses/stat527/s13/readings/EfronTibshirani_JASA_1997.pdf" rel="nofollow">Efron and Tibshiraini 1997</a>. Looking at the paper, I can see how gamma is defined in the case of c... | g64738 | [
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0.03321293741464615,
-0.0043588... |
<p>I have assumed (i.e. I think I was taught, longer ago than I can remember) that regression analyses assume that a sample is homogeneous. If it is not, then the appropriate thing to do is either add dummy variables to code for the different groups included in the sample, or carry out an ANCOVA to test whether group p... | g64739 | [
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0.028462549671530724,
0.037026964128017426,
0.04802786931395531,
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0.0... |
<p>When I fit a ridge regression, in the example that I show in below, with the same lambda=0.1
the estimated coefficients from the ridge package and MASS package are different. What's the difference?
for example when I want to fit dependent variable z to independent x variables as I show below:</p>
<pre><code>x<-r... | g64740 | [
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<p>I want to show that the variable $X$ is significant.<br>
In model 1, I use financial statements variables, other macroeconomic variables and $X$.<br>
Here, $X$ is siginificant at a 10% level and $R^2$ is 0.731.<br>
Since financial statements could have time lag, I have to check that effect so I made adjusted model 2... | g49707 | [
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0.... |
<p>For a CDF that is not strictly increasing, i.e. its inverse is not defined, define the quantile function </p>
<p>$$F^{-1} (u) =\inf \{x: F(x) \geq u \},\quad 0<u<1. $$</p>
<p>Where U has a uniform $(0,1)$ distribution. Prove that the random variable $F^{-1} (u)$ has cdf $F(x)$.</p>
<p>In case of a strictly ... | g49630 | [
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0.03612938150763512,
-0.011036055162549019... |
<p>I am trying to figure out if this Markov chain is irreducible and if it is aperiodic and why or why not.</p>
<p><img src="http://i.stack.imgur.com/i70tF.png" alt="enter image description here"></p>
<p>For me it is not irreducible Markov chain because you cannot go from state 2, 5 or 6 to any of the states 1, 3, 4.... | g64741 | [
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<p>I have samples from normal distributions with the same mean but different standard deviations. I know the corresponding standard deviation for each sample. Is there a way to more accurately estimate mean other than taking an average over all the samples?</p> | g49455 | [
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<p>I'm currently have a bit of difficulty determining how to analyze this data via logistic regression analysis.</p>
<pre><code> - Q18 = DV (satisfaction score ranging from 1-10)
- Q10_1 = IV (Customer Service likert score from 1-5)
- Q10_2 = IV (Sales likert score from 1-5)
- Q10_3 = IV (Performance likert score f... | g64742 | [
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0.05114595964550972,
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-... |
<p>I have a data set $y_i$ (where the $y_i$ are photon counts in time period $i$, $i=1,2,...,n$, assumed Poisson), with an estimated standard error $s_i$ (= $\sqrt{y_i}$) for each count.</p>
<p>For some reason, I normalize the data set by the average count rate $\bar y$.</p>
<p>$\bar y = \frac{\sum y_i}{N}$</p>
<p>w... | g64743 | [
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0.010497390292584896,
0.0237544197589159,
0.04639703035354614,
0.0014116419479250908,
0.0... |
<p>I want to simulate a data set with similar covariance structure as my
observed data (which is a SNP by gene p-value matrix, dim ~600k*8368), and have calculated a covariance matrix (dimensions 8368*8368). So far I've tried two approaches to simulating data (all in R):</p>
<p><code>rmvnorm</code> from the <a href="h... | g64744 | [
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0.... |
<pre><code>Heart Group-1 Group-2
Case1 Case2 Case3 Case1 Case2 Case3
İnflammation - - - +++ ++ ++
Hemorrhage + - - ++ +++ ++
Fibrosis + + - ... | g64745 | [
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0.00268197781406343,
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0.06115216389298439,
-0.0051748... |
<ol>
<li>Came across an article on the web on "evaluation of training effectiveness". The author suggests that the "t-value" obtained from a "Paired t-test" conducted using pre-test and post test scores can be used to quantify the effectiveness of training. </li>
<li>The t-value was termed as the "Index of Learning" an... | g122 | [
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0.0016730992356315255,
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-0.012212212197482586,
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0.02615046128630638,
0.054202962666749954,
-0... |
<p>If you try a real thoroughly won't a computer find all sort of silly patterns? </p>
<ul>
<li>Messages from ETs in the bible</li>
<li>rainy Sundays in China or Australia -> the chances of your sport team win</li>
<li>reading many novels -> having a gay son</li>
</ul>
<p>If you have a huge (and growing amount) of in... | g64746 | [
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-0.07233066856861115,
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-0.0417904332280159,
-0.008533207699656487,
... |
<p>I do not know if it is totally off-topic, but I thought it might be useful to have opinions and an aggregate answer about why volatility is an important topic in financial econometrics.</p>
<p>I think it started with portfolio theory and the need to understand the properties of the underlying second moment of the a... | g64747 | [
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-0.00... |
<p>I have 3 sets of data.</p>
<ol>
<li>A positively labeled dataset. </li>
<li>An unlabeled dataset that has for sure positive (around 75%) and negative data.</li>
<li>An unlabeled dataset that has for sure positive data and maybe negative data.</li>
</ol>
<p>I'm interested in finding negative observations in this la... | g64748 | [
0.0037665439303964376,
-0.03731353208422661,
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0.008849319070577621,
0... |
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