Top new questions this week:
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I'm interested in examples of probability distributions where the quantile function $F^{-1}(p)$ exists in closed form or is easy to calculate but where the cumulative distribution function (CDF) $F(x)$...
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I have a sample of data $(x_i, y_i)$. I hypothesize that $y_i$ is not dependent on $x_i$, but the standard deviation of $y_i$ depends on $x_i$
More concretely, say I assume $\textrm{Var}(y_i | x_i) = ...
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This question must have been asked many times before but I can't find an answer.
I'm getting very confused about when to use a zero-inflated negative binomial regression vs standard negative binomial ...
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I would like to know if aggregating indexes is statistically appropriate.
Specifically, I would like to aggregate the CDC’s social vulnerability index (SVI): https://www.atsdr.cdc.gov/placeandhealth/...
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My data consists of 3 variables, one is a numerical variable of the number of flower visits that I have counted on certain locations and on certain shrub species. My other 2 variables are categorical ...
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I am performing a large number of Welch's t-tests (t-test with unequal variance) on very small sample sizes, often with only two samples per condition. I am finding the p-values are poorly calibrated: ...
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I am looking at this question Statistical inference when the sample "is" the population where the following analysis is given:
User 1: "Treat the population data as a sample and assume ...
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Greatest hits from previous weeks:
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After taking a statistics course and then trying to help fellow students, I noticed one subject that inspires much head-desk banging is interpreting the results of statistical hypothesis tests. It ...
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Principal component analysis (PCA) can be used for dimensionality reduction. After such dimensionality reduction is performed, how can one approximately reconstruct the original variables/features ...
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I am trying to do a scatterplot to see the relationship between literacy and baby mortality. How do I know if literacy is my X axis and baby mortality is my Y axis, or the reverse? How do I ...
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What decides the choice of function ( Softmax vs Sigmoid ) in a Logistic classifier ?
Suppose there are 4 output classes . Each of the above function gives the probabilities of each class being the ...
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I am playing with convolutional neural networks using Keras+Tensorflow to classify categorical data. I have a choice of two loss functions: categorial_crossentropy ...
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I have a dataframe with many observations and many variables. Some of them are categorical (unordered) and the others are numerical.
I'm looking for associations between these variables. I've been ...
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I have seen the min-max normalization formula but that normalizes values between 0 and 1. How would I normalize my data between -1 and 1? I have both negative and positive values in my data matrix.
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Can you answer these questions?
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I seek a peer check on my approach in calculating the sample size for pair-matched or stratified cluster randomized trials assuming 80% power.
Some background on the study: I am working with ...
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I am carrying out a meta-analysis of studies evaluating the association between blood levels of specific environmental pollutants and health outcomes (binary).
Some studies reported OR/RR/HR for ...
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I have a set of product online reviews data. The dataset contains review text and 1-5 star ratings.
I've extracted 5 prevalence topics using R stm package. They are price, design, packaging, promotion ...
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