I'm running PROC LOGISTIC and some of my independent variables are dummy variables. Do I need to include these dummy variables in the CLASS statement? I've run it both ways, including them in the CLASS statement and excluding them, and while I get the same Pr > ChiSq both ways, the estimate is different each way. In fact, when including the dummies in the CLASS statement, it appears that the estimate is in the wrong direction. What's the difference here?