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Because I find them fascinating, I'd like to hear what folks in this community find as the most interesting statistical paradox and why.
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### How to resolve Simpson's paradox?

Simpson's paradox is a classic puzzle discussed in introductory statistics courses worldwide. However, my course was content to simply note that a problem existed and did not provide a solution. I ...
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### Clustering as a means of splitting up data for logistic regression

I'm trying to predict the success or failure of students based on some features with a logistic regression model. To improve the performance of the model, I've already thought about splitting up the ...
25k views

### Positive correlation and negative regressor coefficient sign

Is it possible to obtain a positive correlation between a regressor and a response (+0,43) and, after that, obtain a negative coefficient in the fitted regression ...
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### Exponentiated logistic regression coefficient different than odds ratio

As I understand it, the exponentiated beta value from a logistic regression is the odds ratio of that variable for the dependent variable of interest. However, the value does not match the manually ...
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### Positive correlations to dependent variable, but negative coefficients

First of all, sorry for the huge pictures, but I'm in desperate need of some input and help on the results following a study. I'm trying to interpret the results from my study, but I can't quite ...
431 views

### Better method to estimate gender gap: difference between medians or median gap by occupation?

I'm doing some analysis of Bureau of Labor Statistics data on wages earned by men and women, and I'm trying to determine which of the two methods I've used is the better estimate of the gender wage ...
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### What can I validly conclude about a variable that becomes significant and switches sign when other variables are included in the model?

I have a dataset dat where each row represents a soil sample, with independent variables chemical measurements a, ...
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### Correlations with a linear combination means correlation with individual variables?

I was having this conversation with someone, and I feel like I have an explanation, but would greatly appreciate if someone could verify whether what I'm thinking is just completely wrong. He made ...
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### T test on achievement data before and after an event

Please note Edit Below: I have to establish the statistical relevance of a hypothesis which is of the form H0 = The event lead to an increase in performance Ha = The event caused a negative or no ...
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### If you know a factor is significant, what is a reason why R might think it's not? [duplicate]

I'm running a logistic regression model where anecdotally I expected age to be a very large factor. If you see from the charts I made in Excel before running the model through R, this is how the ...