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SAS_solution
Calcite | Level 5

 

 

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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SAS_solution
Calcite | Level 5

Thank you for the detailed explanation! It is so clear, logic and helpful! Thank you!

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