1zmm, Thx for your patient explanation. Yes that variables with N-prefix are nominal variables, those Prin and factor variables are generated from continuous variables only. After I raised this question, I looked around the community, to find that proc logistic combined with class defining is not recommended, they suggest glmselect as you said. I have one more question,can you take time to reply it? When i used the following code (45 continuous variables) proc princomp data=slide.sb_vm10 cov outstat=temp_prin1; var c1-c45; run; for eg variables A with large scope is within (-1M,1M),variables B with small scope is within (-1,1), it seems that the coefficient for Eigenvectors like prin1 will be Zero for those variables B. Do u know in mind how to deal with such things? Thx in advance.
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