Thanks Steve for your suggestions and answer to my question. I agree with the argument since the subject were destroyed and not replaced during the analysis. True, choosing the right model was difficult, because i choose Proc Mixed. But with the additional information, and the preference for GLIMMIX, then, i will work around and find how to carry out the analysis. Could i have more questions, i will post them out again to the SAS community. I thank you so much for your continued support in my quest to learn more Statistical procedure. Thumbs up. Peter
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