ods output LSMeans=LSM; PROC MIXED data=adpro3 noclprint; CLASS trtn monthn usubjid; MODEL aval = base trtn monthn trtn*monthn /ddfm=kr s; repeated monthn / subject = usubjid type = un; lsmeans trtn*monthn / slice= monthn pdiff cl; RUN; But in the log the following warning information appeared: unable to make hessian positive definite. What's wrong with my coding? What is repeated measure analysis? Please help. Thank you!
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