Hi All, I am using proc mixed model, and i got the following warning. WARNING: Stopped because of infinite likelihood. WARNING: Output 'lsmeans' was not created.  Make sure that the output object name, label, or path          is spelled correctly.  Also, verify that the appropriate procedure options are used to          produce the requested output object.  For example, verify that the NOPRINT option is not          used. The model is working fine with individual visit data but when I run the model with all the visits it failed. No duplicate records, no missing data. The same model worked for even lesser population. Model Used:      proc mixed data=dsnin;        class treatment visit subjid ;     model pchg =  treatment visit treatment *visit base/solution ddfm=satterthwaite;     repeated visit/subject=subjid type=un;     lsmeans treatment *visit/cl alpha=0.05;     ods output lsmeans=means;     run; Any kind of help is greatly appreciated. Thank you. ... View more