Hi, I am constructing a binary logistic regression model using 'proc logistic' in SAS, and the output appears to be error-free with no warning messages. However, when I replicate the same dataset and variables in Python using statsmodels, I encounter an error message indicating possible quasi-complete separation: 'A fraction of 0.20 of observations can be perfectly predicted. This might indicate quasi-separation, and in such cases, some parameters may not be identified.' In light of this discrepancy, I am uncertain about which set of results to trust—those from SAS or from Python. Thank you for any guidance you can provide.
... View more