This question already has an answer here:

When talking about minimum sample size for logistic regression, do they mean the total number of observations in the study, or do they mean number of observations in the categories you are investigating? For example,

Let’s say I have a total sample size of 10 000 respondents (most likely a large enough sample). Of those only 20 respondents have had a certain rare disease Y. I want to investigate what variables are associated with having the disease Y. Can I do that?


marked as duplicate by kjetil b halvorsen, mdewey, Michael Chernick, mkt, Peter Flom Apr 20 at 10:36

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged or ask your own question.