Comments (0) Description of separation in PROC LOGISTIC
If you picture the data as a 2 x 2 crosstab, then quasi-complete separation occurs when one of the cells is 0. Complete separation occurs when one cell in each row and column is 0.
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The problem of coding 0 and 1 in PROC LOGISTIC
PROC LOGISTIC can be used to run logistic regression on a dichotomous dependent variable. Often, these are coded 0 and 1, with 0 for `no’ or the equivalent, and 1 for `yes’ or the equivalent. In this case, we are usually interested in modeling the probability of a ‘yes’. However, by default, SAS models the probability of a 0 (which would be a `no’).
This is a talk I’ve given at Northeast SAS Users Group (NESUG) and at SAS Global Forum (SGF)
