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PROC LOGISTIC: Traps for the unwary
This paper covers some 'gotchas' in SAS® PROC LOGISTIC. A 'gotcha' is a mistake that isn't obviously a mistake — the program runs, there may be a note or a warning, but no errors. Output appears. But it's the wrong output. This is not a primer on PROC LOGISTIC, much less on logistic regression. There are many good books on logistic regression; one such is Hosmer and Lemeshow .
Each section has several subsections. First, I identify the 'gotcha'. Then I give an example. Third, I show what evidence you have that it occurs. Fourth, I show how to fix it — in some cases, referring to other resources. In some cases, I offer an 'explanation' between the evidence and the solution.