Programming the statistical procedures from SAS

Proc Mixed with warning "unable to make hessian positive definite"

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Proc Mixed with warning "unable to make hessian positive definite"

 

 

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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‎03-25-2018 04:45 PM
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Re: Proc Mixed with warning "unable to make hessian positive definite"

Posted in reply to SAS_solution

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Solution
‎03-25-2018 04:45 PM
Respected Advisor
Posts: 3,018

Re: Proc Mixed with warning "unable to make hessian positive definite"

Posted in reply to SAS_solution
New Contributor
Posts: 2

Re: Proc Mixed with warning "unable to make hessian positive definite"

Posted in reply to SAS_solution

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

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