question stringlengths 37 38.8k | group_id stringlengths 2 6 | sentence_embeddings listlengths 768 768 |
|---|---|---|
<p>After doing PCA it is common that the first component describes the largest part of variability. This is important in i.e. study of body measurements where it is commonly known (<a href="http://goo.gl/4jsCa" rel="nofollow">Jolliffe, 2002</a>) that PC1 axis captures size variation. My question is whether PCA scores a... | g67388 | [
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<p>Is there an efficient approach tailored to sampling from a PDF $k \cdot f(x) \cdot g(x)$ (where $k$ is a normalizing constant) that would perform better than naive Metropolis, slice sampling, etc.? Can we exploit the fact that both $f(x)$ and $g(x)$ can already easily be sampled from?</p>
<p>An example of this migh... | g26912 | [
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<p>I am working on text classification using TF/IDF and cosine similarity metrics. In computing the similarity between two records (objects) in a database, TF/IDF assigns weight vector for each record by assigning weight score to each attributes (strings) in a record. Cosine similarity is then used to measure the simil... | g67389 | [
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<p>I am using latent class analysis to cluster a sample of observations based on a set of binary variables. I am using R and the package poLCA. In LCA, you must specify the number of clusters you want to find. In practice, people usually run several models, each specifying a different number of classes, and then use va... | g26915 | [
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<p>I have 8 predictor variables and 1 criterion variable, all variables are measured by 9 different constructs, some are 0-4 Likert scales, some are 1-5 Likert scales, can I use their mean scores and run a multiple regression?</p> | g67390 | [
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<p>I have a math coursework where we are supposed to find the MLEs of the following distribution:</p>
<p>$$ p(x;\alpha) = \frac{1+\alpha x}{2}, x \in [-1,1], \alpha\in[-1,1] $$</p>
<p>I'm just curious as to what it is as I have never seen it before. It is apparently used for modelling something about muon disintegrat... | g39077 | [
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<p>There are many models for spatial point patterns and spatial marked point patterns that assume spatial homogeneity or stationarity. </p>
<p>i) Is there a statistical test for determining this, where the null is that of stationarity? </p>
<p>ii) Is there a procedural way of looking at the data to gauge/have a say ... | g67391 | [
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<p>What is the Standard Error of the Lognormal distribution? I am particularly interested in comparing two probabilities from the distribution. I have the two proportions based on experiments, in general these proportions follow a lognormal fit. </p>
<p>The standard error of differences from a normal distribution is s... | g67392 | [
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<p>The following is a problem that I keep encountering in different forms. For now, I give one example, but I would also be interested in the answers to the more general question.</p>
<p>I have a design with a reaction time based dependent variable $Y$, two hypothesis-relevant between participants factors ($A$ and $B$... | g47492 | [
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<p>I have a question about using panel unit root test and panel co integration test. I used IPS unit root test then I realized my variables are I(1) can I now use kao co-integration test for checking long run relationship? I think IPS is for heterogeneous panels & kao is for homogeneous panels so we can not use bot... | g67393 | [
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<p>Recenly I am reading "Mathematical statistics and data analysis" written by Rice myself. At page 207, theorem A said:
With simple random sampling, approimxate variance of $R=\frac{\overline{Y}}{\overline{X}}$ is
$Var(R)\approx\dfrac{r^2\sigma^2_{\overline{X}}+\sigma^2_{\overline{Y}}-2r\sigma^2_{\overline{XY}}}{\mu^2... | g67394 | [
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<p>I have data from two sources; the two data sets were obtained from different geographical locations and at different historical times. I do not want to pool them into one data set sample and lose information about differing values of parameters that generated those collections, but I also cannot use Bayesian hierarc... | g67395 | [
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<p>I have two classifiers that classify some data points in the test set into either class 0 or 1. </p>
<p>They each might have the same or different predictions for each test item. I want to compare them using Fisher's sign test in order to tell which is performing better. I am not sure how to do that and I am not ab... | g47493 | [
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<p>You are interested in estimating the proportion of female students at the University. Determine the sample size to be 95% Confident that the estimated value will be within +/- 0.098 of the real value. There is no prior information about the population proportion</p>
<p>The answer is 100. How is that correct?</p> | g67396 | [
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<p>Stats question I need help with... Any help would be great thanks</p>
<blockquote>
<p>Scores for a civil service exam are normally distributed, with a standard deviation of 6.9. To be eligible for civil service employment, you must score in the top 5%. If the lowest score you can earn and still be eligible for em... | g67397 | [
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<p>I am stuck with a stats question..... help please</p>
<blockquote>
<p>A television manufacturer is studying television remote control usage. One of the criteria they are measuring is the distance at which people attempt to activate the television set with the remote control. They have discovered that the activati... | g49760 | [
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<p>There are three groups that received different treatments and then learn a task which they are scored on over the course of 60 sessions.</p>
<p>1) <strong>How to choose a function to fit?</strong>
-The best choice in this case would be <code>s=asym/(1+exp((midpt-x)/rate))</code>, but say you didn't know that.</p>
... | g67398 | [
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<p>This is a homework question:</p>
<p>Suppose that $X_0=1$ and that for $n\geq 1$ $$X_n\sim \left\{
\begin{array}{l l}
U(0,X_{n-1}) & \quad \text{with probability $1-X_{n-1}/2$}\\
U(X_{n-1},1) & \quad \text{with probability $X_{n-1}/2$}
\end{array} \right.$$ Determine the limiting behavior of $X... | g67399 | [
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<p>Is it correct (perhaps at least as a good approximation) to determine sample size via a power analysis that assumes an infinite population and then to adjust the required sample size by a finite population correction?</p>
<p>For example, I am using the formula from Fleiss: </p>
<p><img src="http://i.stack.imgur.co... | g67400 | [
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<p>I have seen surveys that use the following method to rank multiple items against each other. Let's say you have 25 items and you want to know their rank order (according to the survey-taker's preference). You pick 5 at random and ask the survey-taker to pick their favourite and least favourite of the group. You can ... | g67401 | [
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<p>I thought about it and I think ILS satisfies almost all OLS assumptions but I don't know if it satisfies homoskedasticity. </p>
<p>Please drop hints if possible, thanks!</p> | g67402 | [
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<p>I am working on a programming problem of 2 dependent variables X and Y. X is made of feature vector of size [128 x 1] and Y is the observation.</p>
<p>My problem is that the 2 variables are dependent that is given X we should compute probability of Y i.e P(Y|X) or given Y we should compute P(X|Y).</p>
<p>I am unce... | g21367 | [
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<p>I'm reading a paper on data mining, and the authors mentioned that "we bootstrapped a classifier". I understand that bootstrapping means sampling with replacement, but I didn't understand how that relates to classifiers.</p> | g11336 | [
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<p>Imagine you are modelling an outcome based on two discrete factors, <code>factor1</code> and <code>factor2</code>, which can be yes or no.</p>
<p>You could do something like:</p>
<pre><code>model <- lm(outcome ~ factor1 + factor2)
</code></pre>
<p>Now suppose that out of the four combinations of values for the... | g67403 | [
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<p>I have to compare pairs of audio strems as 1d time series. Looking at the aligned trajectories I need to either cluster them together or assume they arise from independent generators.
I remember hearing of Dirichlet processes being applied. Could try to defined a hidden Markov model on the structure, not sure yet ... | g67404 | [
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<p>I'm a master CS student in a German university now writing my thesis. I will be done in two months I have to make the <strong>very hard</strong> decision if I should continue with a PhD or find a job in the industry.</p>
<p>My reasons for doing a PhD:</p>
<ul>
<li><p>I'm a very curious person and I feel I still la... | g67405 | [
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<p>I'm in no way a statistician (I've had a course in mathematical statistics but nothing more than that), and recently, while studying information theory and statistical mechanics, I met this thing called "uncertainty measure"/"entropy". I read Khinchin derivation of it as a measure of uncertainty and it made sense to... | g67406 | [
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<p>When performing linear regression, it is often useful to do a transformation such as log-transformation for the dependent variable to achieve better normal distribution conformation. Often it is also useful to inspect beta's from the regression to better assess the effect size/real relevance of the results.</p>
<p>... | g39152 | [
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<p>I'm investgating the repeatability of an experimental process (actually measuring lift in a wind tunnel), which can be measured using a single number, Q. However, I only have limited access to the tunnel so the number of experiments that I can run is restricted.</p>
<p>If I have 5 experiments with the tunnel in one... | g67407 | [
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<p>I have some data examples. If I split the data into three parts and the have some scores for each example of the three parts and then calculate individual AUCs for the three parts</p>
<p>In the next case, I keep all the data examples in one cluster, use the same scores as before and calculate the AUC over this whol... | g67408 | [
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<p>The matrix could be as large as $2500\times 2500$, what is the best algorithm to do that, is there some algorithm that is easy to write a program, is there any convenient packages for that?</p> | g67409 | [
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<p>A <a href="http://en.wikipedia.org/wiki/Particle_filter">particle filter</a> and <a href="http://en.wikipedia.org/wiki/Kalman_filter">Kalman filter</a> are both <a href="http://en.wikipedia.org/wiki/Recursive_Bayesian_estimation">recursive Bayesian estimators</a>. I often encounter Kalman filters in my field, but v... | g67410 | [
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<p>I'm a newbie at stats/machine learning so please bare with me.</p>
<p>This plot is a result of an experiment that attempts to find the perceived angle of a stimulus.</p>
<p><img src="http://i.stack.imgur.com/QRVeW.png" alt="enter image description here"></p>
<p>The stimulus is placed at a position (see the X axis... | g29629 | [
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<p>I try to compute the marginal and conditional R² for a GLMM using a negative binomial distribution by following the procedure recommended by Nakagawa & Schielzeth (2013) . Unfortunately, the supplementary material of their article does not include an example of a negative binomial distribution (see the online ve... | g67411 | [
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<p>Suppose I have some i.i.d. data $x_1, \ldots, x_n \sim N(\mu, \sigma^2)$, where $\sigma^2$ is fixed and $\mu$ is unknown, and I want to estimate $\mu$.</p>
<p>Instead of simply giving the MLE of $\mu = \bar{x}$, one could estimate</p>
<p>(1) $\mu = \lambda \mu_0 + (1 - \lambda) \bar{x},$</p>
<p>for some "prior be... | g67412 | [
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<p>It is common to use weights in applications like mixture modeling and to linearly combine basis functions. Weights $w_i$ must often obey $w_i ≥$ 0 and $\sum_{i} w_i=1$. I'd like to randomly choose a weight vector $\mathbf{w} = (w_1, w_2, …)$ from a uniform distribution of such vectors.</p>
<p>It may be tempting to ... | g39216 | [
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<p>Let's say I'm playing 10 "games". For each game, I know the probability of winning, the probability of tying, and the probability of losing.</p>
<p>From these values, I can calculate the probability of winning X games, the probability of losing X games, and the probability of tying X games (for X = 0 to 10).</p>
... | g67413 | [
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<p>I've been searching the internet far and wide... I have yet to find a really good overview of how to interpret 2D correspondence analysis plots. Could someone offer some advice on interpreting the distances between points? </p>
<p>Perhaps an example would help, here is a plot that's found on many of the websites I'... | g49643 | [
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<p>I have seen a few queries on clustering in time series and specifically on clustering, but I don't think they answer my question. </p>
<p><strong>Background:</strong> I want to cluster genes in a time course experiment in yeast. There are four time points say: <em>t1</em> <em>t2</em> <em>t3</em> and <em>t4</em>... | g67414 | [
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<p>Can an effect size be calculated for an interaction effect in general and more specifically using the F-statistic and its associated degrees of freedom? If yes, should this be done and what is the appropriate interpretation of the effect size given the nature of interaction effects? Initially, I assumed the answer... | g5277 | [
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<p>Thanks for reading my question.</p>
<p>I have several thousand data points scattered on an (x,y) grid that I am trying to cluster. The data points are not uniformly distributed across the grid, but are concentrated in certain areas. I am most interested in identifying the centers of the clusters as representing s... | g47518 | [
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<p>This question is more about an approach to a complicated data situation rather than particular statistical methods.</p>
<p>I'm modeling our organization's electricity bills, and I have monthly billing data from 2008 to the present. I have a fairly accurate model for electricity usage, based on the month's average t... | g67415 | [
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<p>I'm running linear regression model on a post-intervention test score controlling for pre-intervention test score. I used Box-Cox transformation on the post-intervention test score to normalize it. Since there no normality assumption imposed on independent variable, I plan not to transform the pre-intervention test ... | g67416 | [
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<p>Suppose we have declared four motion types for air-plane. If we represent each maneuver with a trajectory line, what is the best classification method to retrieve the trajectory pattern with a similar trajectory shape to the new trajectory path? The proposed method should be able to classify partial paths so that we... | g67417 | [
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<p>I'm interested in using a wavelet transform, Haar for example, to create classification variables from time series data to use in logistic regression.</p>
<p>Simple example. Let's say I'm trying to predict payment defaults and I have a person's monthly expense data and I know that someone with consistent expenses i... | g26936 | [
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<p>I am currently working on matlab and I am new to it. I would like to know how do i average the results from the folds (or otherwise combined) to produce a single estimation.</p>
<p>My dataset has 2 class labels +1 and -1. and k=5. I use the knnclassify() method in matlab in order to perform cross validation.</p>
<... | g48606 | [
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<p>I have simulated an ARIMA(1,0,1) process using R. Below is the code.</p>
<pre><code>library(stats)
library(forecast)
set.seed(101)
y <- arima.sim(n=1000,list(ar=0.2,ma=0.6))
plot(y)
qa <- arima(y,order=c(1,0,1))
</code></pre>
<p>Below is the output:</p>
<pre><code>ARIMA(1,0,1) with non-zero mean
Coefficie... | g67418 | [
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0.0800500363111496,
0.0396001823246479,
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<p>I was wondering what time series model would forecast future values in such a static but decreasing manner? ( I'm talking about the values around where the circle appears, as apparently, the data set that I have does that, judging from the graph, but I'm a beginner and not sure what model would do that? though I th... | g67419 | [
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... |
<p>I have a network and for each node in the network I am calculating a certain property, essentially its 'connectedness' to a set of source nodes. In order to identify nodes which are better connected than nodes <em>at a similar geometric distance from the source nodes</em>, I have grouped nodes into shells of given ... | g67420 | [
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<p>I currently have a sample of 100+ job descriptions, which I am categorizing with the intention of identifying the most common areas of job activity within a company - including, and this is important - overlaps. What I am looking for is a software solution that would help me display the ensuing relationships visuall... | g800 | [
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<p>I am looking at a time series which has no obvious trend, but seems to have an intercept a little above zero. The results I get for <a href="http://rss.acs.unt.edu/Rdoc/library/urca/html/ur.df.html" rel="nofollow"><code>ur.df</code></a> function in R is the following:</p>
<pre><code>logprice_df <- ur.df(test3, l... | g67421 | [
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0.04951893165707588,
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<p>I currently read the paper <a href="http://machinelearning.wustl.edu/mlpapers/paper_files/jmlr10_duchi09a.pdf" rel="nofollow">Efficient Online and Batch Learning using Forward-Backward Splitting</a> by John Duchi and Yoram Singer. I am very confused about the usage of the terms 'Online' and 'Batch'.</p>
<p>I though... | g67422 | [
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<p>I am creating a testing dashboard for displaying the results of our website testing. We run A/B tests and Multivariate tests. My testing code is sound (the gathering of the raw conversion data), but now I am working on finishing out our results reporting admin dashboard. (before we used a very old version of JMP to ... | g67423 | [
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<p>I'm doing an experiment with a cryostat to determine the critical temperature for lead. To avoid asymmetries, I determine the critical temperature both through heating (going from 2 K to 10 K) and cooling (10 K -> 2 K).</p>
<p>Now I have two values, that differ slighty and I average them. So a measurement of (6.942... | g67424 | [
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<p>This is a question I originally posted on r-help but it is more suited here. I will post the question and the answer I received from Dr. Winsemius and would be most grateful for any additional answers you can provide. </p>
<p>I am evaluating survival models using Brier score (“peperr”) and Harrell’s C-Index (“Hmisc... | g26941 | [
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<p>I'm trying to use a zero-inflated gamma model (or a gamma 'hurdle' model). The model is a mixture of logistic regression and generalized linear modeling. I can do this analysis in two steps: 1) do a logistic regression against presence/absence data and then 2) Use a generalized linear model with a gamma distribution... | g67425 | [
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<p>I am looking in a dataset that consists of frequencies of mutations of a certain type and want to identify distinct populations within that dataset so I can then use supervised analysis to pick out what is different between those groups from other data I've got. </p>
<p>What approaches would you recommend? (Hierarc... | g67426 | [
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<p>I have a linear model with about 6 predictors and I'm going to be presenting the estimates, F values, p values, etc. However, I was wondering what would be the best visual plot to represent the individual effect of a single predictor on the response variable? Scatterplot? Conditional Plot? Effects plot? etc? How wou... | g67427 | [
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<p>I have a problem which can be generalized as follows. There is some black-box which produces actions {0, 1}. Having two sequences: <strong><em>X</em></strong> - series of previous actions, <strong><em>T</em></strong> - series of time intervals between actions, how can I predict next action? <strong><em>T</em></stron... | g67428 | [
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<p>My book states that $\mathrm{E}[X_2] = \mathrm{E}[\mathrm{E}[X_2\mid X_1]]$ and gives a weird proof and a short paragraph about how awesome this result is and how intuitive this is.</p>
<p>I neither understand the proof nor do I understand the "intuition". Can someone give me both? </p>
<p>The textbook proof uses ... | g39347 | [
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<p>I want to do principal component analysis (factor analysis) on SPSS based on 22 variables. However, some of my variables are very skewed (skewness calculated from SPSS ranges from 2–80!). </p>
<p>So here are my questions:</p>
<ol>
<li><p>Should I keep the skewed variables like that or could I transform the v... | g26946 | [
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<p>I have to represent some forecasting deviations into a chart. The problem is that I can’t find the proper way to do it. I don't know which approach to use in order fit with the data type I'm working with. The biggest is the traffic the more accurate the forecasts is. The following table represents the forecast devia... | g26948 | [
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0.07020165771245956,
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-0.055272821336984634,
-0.013088038191199303,
0.020698919892311096,
-0.026644479483366013,
0.048356592655181885,
-0... |
<p>I would like to find predictors for a continuous dependent variable out of a set of 30 independent variables. I am using Lasso regression as implemented in the <a href="http://cran.r-project.org/web/packages/glmnet/index.html">glmnet</a> package in R. Here is some dummy code:</p>
<pre><code># generate a dummy datas... | g67429 | [
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0.023730313405394554,
0.032992586493492126,
0.08445004373788834,
... |
<p>I have a certain computational biology problem I wish to model. Say I have a vector $\vec{f}$ that yields $\vec{p}$, of which the explicit form amounts to picking $\vec{p}$ as an eigenvector from an eigenvalue-problem with the largest associated eigenvalue.</p>
<p>$\vec{p}$ is a probability vector, i.e. its compon... | g26951 | [
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<p>I am using SVM for document categorization. For that I have training sets i.e. set of training vector with their category. For example I have following sample data(assumption):</p>
<p><pre>
-1 1:1 2:1
+1 2:1 4:1
-1 3:1 5:1
+1 1:1 6:1</pre></p>
<p>Can any one say:<br><br>
1) How to plot the data point... | g67430 | [
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0.0017... |
<p>How can I find out if the differences in length and width of cut marks left in fabric are significantly different between groups (knife types)?</p>
<p><strong>Additional Information</strong></p>
<p>Groups:</p>
<pre><code>KnifeType1 n=15
KnifeType2 n=15
KnifeType3 n=11
KnifeType4 n=15
KnifeType5 n=6
KnifeType6 n=4... | g67431 | [
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<p>So we have a questionaire of 32 questions (answer 1-7 on each question) where we present the results in grouped in four areas (Question 1-8 in one, 9-16 etc), since we think that those questions belong together.</p>
<p>We are now trying to find out of these grouping are correct or if maybe some should switch betwee... | g39401 | [
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<p>I am looking for some recommendations and more specifics about how to do the following:</p>
<p>Objective: To determine the weights of a number of stock valuation metrics. I am looking at doing this across 10 different industry sectors as I expect that each sector will merit a different weighting scheme.</p>
<p>The... | g67432 | [
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<p>I am wondering are there any assumptions that must be met in the proportional hazard regression model with frailty? I remember that in regular proportional hazard model without frailty all variables need to significant in log-rank test which means that the survival curves for each variable differ significantly and a... | g21730 | [
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<p>I am trying to use write my own <code>stochastic</code> and <code>deterministic</code> variables with <code>pymc3</code>, but old published recipe for <code>pymc2.3</code> explained how we can parametrize our variables no longer works. For instance I tried to use this direct approach and it failed:</p>
<pre><code>d... | g67433 | [
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0... |
<p>I have the below results based on the engle-granger test for cointegration, where the dependent and independent variables themselves are not stationary. The results show that null (process is not cointegrated) is rejected for lags 0,1,2 for both single mean and trend. However, lags 3,4,8 fail to reject the null. Is ... | g26956 | [
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0.03290139511227608,
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0.03458858281373978,
-0.0161... |
<p>yt = u + 0et + 0et-1 + 0et-2</p>
<p>01= .5
02 = .25</p>
<p>My series of existing data is :</p>
<p>1,0,2,0,1,0 </p>
<p>So I estimate the first forecast value will be :</p>
<p>yt+ 1 = .66 + .5(-.66) + .25 * .34
yt = 1 = .4125</p>
<p>I have had a go at this in an excel document but I am certain it is not correct... | g29639 | [
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<p>Sorry for this beginner's question... I have googled this for a while with no success.</p>
<p>I do a linear regression using R lm function:</p>
<pre><code>x = log(errors)
plot(x,y)
lm.result = lm(formula = y ~ x)
abline(lm.result, col="blue") # showing the "fit" in blue
</code></pre>
<p><img src="http://i.stack.i... | g49921 | [
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0.04952703416347504,
0.061676427721977234,
0.030... |
<p>I am working on an assignment for a Stochastic Modeling class and am stuck on the following question:</p>
<blockquote>
<p>Let $X$ have probability mass function $p_j = P \lbrace X = j \rbrace $ for $j \geq 1$. Let</p>
<p>$\lambda_n = P \lbrace X = n|X > n − 1 \rbrace = \frac{p_n}{1-\sum^{n-1}_{j=1} p_j}$.... | g26959 | [
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0.06619472801685333,
0.00... |
<p>I have had a look around the forum, and despite some similar questions on measurement error, no one appears to have asked this question specifically. </p>
<p>I have developed a test where a small group of participants $(n = 40)$ have undertaken three trials each of the test in total. See the two attached figures fo... | g26962 | [
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0.050565917044878006,
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0.04546116292476654,
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0.0... |
<p>I have something that should be a super simple one-line command in Stata. </p>
<p>I have a bunch of rows that are disaggregated simply because one variable is different. That one variable isn't important, so I want to combine all of the rows into one and just have NA or whatever for that one variable. </p>
<p>One... | g67434 | [
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0.024342073127627373,
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0.009810220450162888,
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0.03683087229728699,
0.0... |
<p>Had a question on a quiz I chose a (I and III) but the teacher said d.(all the above) </p>
<blockquote>
<p>Which of the following statements about residuals are true? </p>
<p>I. The means of the residuals is always zero</p>
<p>II. The regression line for a residual plot is a horizontal line. </p>
... | g47557 | [
0.03307849168777466,
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0.0382230244576931,
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<p>So in (unsupervised) text modeling, Latent Dirichlet Allocation (LDA) is a Bayesian version of Probabilistic Latent Semantic Analysis (PLSA). Essentially, LDA = PLSA + Dirichlet prior over its parameters. My understanding is that LDA is now the reference algorithm and is implemented in various packages, while PLSA s... | g67435 | [
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0.005319919437170029,
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0.04438864067196846,
0.0... |
<p>If I want to use some proportion type independent variables in a logistic regression, then what will be the interpretation of the regression coefficients corresponding to those proportion type variables? Will that mean- "The change in log odds for per unit change in the proportions"? </p>
<p>But what will be meant ... | g26964 | [
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-0.04370375722646713,
-0.041847702115774155,
0.04614724591374397,
0.014075848273932934,
... |
<p>Consider the frequentist argument: "I will believe A since not-A makes the data improbable".
Consider the Bayesian argument: "I will believe A since given my beliefs on A and the data generating process, it is more probable than not-A".</p>
<p>Are there any other argument types and how would you construct an argume... | g67436 | [
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0.03423425555229187,
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0.... |
<p>I am calculating chi-squared in R and manually, and getting two different answers. I believe that R is correct, but I am not 100% sure. Can someone please help me understand why?</p>
<p>In R:</p>
<pre><code>test <- matrix(c(4203, 4218, 786, 771), ncol=2)
dimnames(test) <- list(group = c("control",... | g49458 | [
0.040963396430015564,
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0.003747130511328578,
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0.06656504422426224,
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0.056413013488054276,
0.025409523397684097,
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0.030455604195594788,
-0.04266715794801712,
0.049215324223041534,
-0.0009604084771126509,
-... |
<p>Regarding propensity score weighting (IPTW) when doing Cox proportional hazard modeling of time-to-event survival data:</p>
<p>I have prospective registry data where we're interested in looking at treatment effect of a medication that in most cases the patients were already taking at baseline. I'm therefore not sur... | g67437 | [
0.03566017001867294,
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0.012817930430173874,
0.04749583452939987,
0.03360046446323395,
0.03903486952185631,
-0.0116... |
<p>I would like to conduct a meta-analysis to investigate the interaction of three variables:<strong>hair color</strong> (dark/light), <strong>gender</strong> (male/female) and <strong>size</strong> (continuous).</p>
<p><img src="http://i.stack.imgur.com/FJVU6.png" alt="enter image description here"></p>
<p>I have th... | g67438 | [
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0.007315255235880613,
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-0.015374989248812199,
-0.04379166662693024,
0.004646668676286936,
0.05516568198800087,
... |
<p>If I have a compositional data set and I wish to compare them using a metric, which is better Eucledian Distance or Mahalanobis Distance ?
Comparing them after using a centered log ratio transformation.
Example of Data set:</p>
<ul>
<li>[ 0.016, 71.2, 0.123, 1.74, 14.0, 0.002, 2310, 0.064, 0.29, 0.32,
5.63, 96.5, 0... | g67439 | [
0.06119371950626373,
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0.008667764253914356,
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0.02241971530020237,
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0.05374857410788536,
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-0.018753446638584137,
0.04144946485757828,
0.00087976164650172,
0.07607150822877884,
-0.0716... |
<p>In Java, I have a set of users, each of which has a Poisson-distributed demand with a known mean:</p>
<pre><code>import org.apache.commons.math3.distribution.PoissonDistribution;
public class User {
private int mean;
private PoissonDistribution dist;
public void setMean(int mean) {
this.mean = mean;
... | g67440 | [
-0.019583364948630333,
0.010767897590994835,
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0.015180179849267006,
0.001033032895065844,
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-0.02810497209429741,
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0.019053865224123,
0... |
<p>I need to fit new data to a previous Ets model.</p>
<p>From the documentation (?ets into RStudio) i can read this parameter:</p>
<p><strong>model:</strong> It is also possible for the model to be equal to the output from a previous call to ets. In this case, the same model is fitted to y without re-estimating any ... | g26969 | [
0.002165737561881542,
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0.005262687802314758,
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0.016965582966804504,
0.0015748480800539255,
0.008597452193498611,
0.05766139551997185,
-0.... |
<p>I am dealing with sentiment results of web articles. Sentiment is represented with two int values, +ve and -ve.</p>
<p>For given article "xyz" I am getting different sentiments while testing at different time period. Each result has +Ve and -ve value. I represent them using 2-D Graph on x-y axis. </p>
<p>My purpos... | g67441 | [
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0.025505775585770607,
0.03294084966182709,
0.006038750987499952,
0.04276857152581215,
0.02... |
<p>Removing linear combinations and correlated predictors from a dataset is something I do when I have to fit a linear regression. I wonder though how this technique affects in general the outcome of e.g. SVM or Random Forest.</p> | g67442 | [
0.045342251658439636,
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0.025019507855176926,
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0.027188068255782127,... |
<p>I like Peter Flom's answer to an earlier question about multicollinearity in logistic regression, but David Garson's Logistic Binomial Regression states that there is no valid test for multicollinearity for binary-dependent logistic regression, even if the independent variables are ratio scale. Can anyone supply one... | g67443 | [
0.0012708979193121195,
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0.025140589103102684,
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<p>I am having difficulties with the interpretation of the regression results from estimating a growth regression in a dynamic panel data set-up, estimated using Stata. (I'm using difference GMM and system GMM estimators by Arellano-Bond and Arellano-Bover/Blundell-Bond respectively).</p>
<p>For my thesis I am interes... | g67444 | [
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0.0470612570643425,
0.003139317035675049,
0.01... |
<p>With the recent FIFA world cup, I decided to have some fun and determine which months produced world cup football players. Turned out, most footballers in the 2010 world cup were born in the first half of the year.</p>
<p>Someone pointed out, that children born in the first half of the year had a physical advantage... | g26974 | [
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<p>This link describes how to perform a random walk on the simplex using the Metropolis-Hastings algorithm:</p>
<p><a href="http://en.wikipedia.org/wiki/User%3aSkinnerd/Simplex_Point_Picking" rel="nofollow">http://en.wikipedia.org/wiki/User:Skinnerd/Simplex_Point_Picking</a></p>
<p>The description says: </p>
<p>"The... | g26976 | [
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-0.044077832251787186,
-0.05112232640385628,
0.01752534881234169,
0.03925943002104759,
0.05316932126879692,
-0.014589985832571983,
0.0667916014790535,
0.011313438415527344,
0.0436302125453949,
0.03477577865123749,
0.00137... |
<h3>Background</h3>
<p>I have a colleague interested in a particular disease and specifically if the continuous variable $X$ is different between controls and patients. Preliminary results suggest that patients have higher values of $X$ than controls.</p>
<p>The straightforward approach would be a unpaired <strong>t-... | g26977 | [
-0.0033404550049453974,
-0.006512757390737534,
0.0025105567183345556,
-0.0636652261018753,
0.01984892413020134,
-0.006999114993959665,
-0.004543900024145842,
-0.03389761596918106,
-0.00004945139153278433,
-0.020016131922602654,
0.05397003889083862,
0.016350988298654556,
0.03252578154206276,
... |
<p>Are conditional multinomial logits used for recommendation engines? Although they are commonly used in econometrics, I've never heard it used or discussed in the context of recommender systems.</p>
<p>Economists use multinomial conditional logits to model which of several options a person would choose and how much ... | g67445 | [
-0.029637109488248825,
0.0279214046895504,
0.002830890705808997,
0.008322536014020443,
-0.03417980298399925,
-0.046361688524484634,
-0.05651049688458443,
0.008673926815390587,
-0.04864511266350746,
0.020023303106427193,
0.020012931898236275,
-0.03752470016479492,
0.06421267986297607,
-0.01... |
<p>I'm trying to get some model averaged effect sizes from a set of candidate models, all of them assuming a Gamma error distribution, according to the theory given by the book from Burnham and Anderson (2002). </p>
<p>For the calculation I'm using the function <code>modavg</code> from the R package <code>AICcmodavg</... | g67446 | [
-0.04332801327109337,
-0.053933169692754745,
0.004459007643163204,
-0.03936774656176567,
0.027060125023126602,
-0.015589782036840916,
0.03742014616727829,
0.028064001351594925,
-0.07435070723295212,
0.03256605193018913,
0.0030949413776397705,
0.016832450404763222,
0.0506773516535759,
0.070... |
<p>How can I analyze the $\lambda_U$ and $\lambda_L$ results (estimated by non-parametric method)? What does higher or lower coefficients mean? Does $\lambda_U = 0.5$ mean there's some kind of linear dependence between $X$ and $Y$?</p>
<p>This is what I mean by $\lambda_U$ and $\lambda_L$:</p>
<p><img src="http://i.s... | g67447 | [
0.01325739175081253,
-0.01287448313087225,
-0.023018665611743927,
-0.021485188975930214,
0.051807910203933716,
-0.03163943812251091,
0.02267647348344326,
-0.023041097447276115,
-0.06618253141641617,
-0.06116481125354767,
-0.14096622169017792,
0.03327008709311485,
0.03295537456870079,
0.038... |
<p>This is same as <a href="http://math.stackexchange.com/questions/647713/a-problem-on-test-of-hypothesis">http://math.stackexchange.com/questions/647713/a-problem-on-test-of-hypothesis</a></p>
<p>Let $X$ & $Y$ be two distributions take values from 1 to 100. I have a machine $M$
which follows either $X$ or $Y$ an... | g67448 | [
0.007182752713561058,
-0.010323463939130306,
-0.02002754621207714,
-0.02668033353984356,
-0.050662945955991745,
-0.02463969588279724,
0.002088378882035613,
0.03981773182749748,
-0.019524933770298958,
-0.008909858763217926,
0.013698865659534931,
0.012418304570019245,
0.06625223159790039,
0.... |
<p>The following information is given: Based on a sample x(n), with n = 1,..., 100 from the exponential distribution, we want to estimate lambda but the original data was lost; we only know that 38 observations are >= 1 and 11 observations are >= 2. Combining the information based on the 38 greater than or equal to 1 a... | g67449 | [
0.03356499969959259,
-0.031430911272764206,
-0.006816597655415535,
-0.026149574667215347,
0.06289288401603699,
-0.04415151849389076,
-0.04249610751867294,
0.006170591805130243,
-0.06876853108406067,
0.021447474136948586,
-0.0115374019369483,
-0.005185388494282961,
0.0447593592107296,
0.020... |
<p>I am trying to determine differences in fish weights from 1st to 2nd sampling between a control group and 4 different treatment groups. My groups are unbalanced (control = 1 group, t1= 2 groups, with t2,t3,t4 = 3 groups). Originally I was told this shouldn't be a problem.</p>
<p>I've run a 2-way ANOVA and the Lev... | g67450 | [
-0.03770489990711212,
-0.022598182782530785,
-0.008411685936152935,
-0.060464419424533844,
0.03393931686878204,
-0.06106750667095184,
0.047758396714925766,
0.06135771796107292,
-0.029983989894390106,
0.02239551953971386,
0.010113264434039593,
0.045447636395692825,
0.004032989498227835,
0.0... |
<p>Given two sets of data:</p>
<ul>
<li>Total usage of a few hundred products across the population as a whole</li>
<li>Per-consumer usage of those products for a sample of consumers</li>
</ul>
<p>I'd like to choose weights for each sample member such that the sum product of their weights and product consumption matc... | g26985 | [
0.040090158581733704,
0.010505570098757744,
-0.0038093046750873327,
-0.01990792341530323,
-0.021833090111613274,
-0.05610702931880951,
0.008291521109640598,
-0.005425869952887297,
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-0.018863437697291374,
-0.013933474197983742,
-0.008794760331511497,
-0.02289482206106186,... |
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