Covariance Parameter Values At Last Iteration

mbakare — Sun, 10 Nov 2019 15:03:56 GMT

Hi Everyone,

proc mixed returned the statement "Covariance Parameter Values At Last Iteration" which is an indication that I don't have convergence solution even though some covariance parameter estimates are displayed. Unfortunately, It could not give me "Fit statistics" from where I would extract "-2 Res Log Likelihood" to carry out likelihood ratio test. Please how do I improve efficient of my proc mixed procedure to have convergence so as NOT to display "Covariance Parameter Values At Last Iteration"

Meanwhile the result from other traits seem to be good.

See my script below

ods output Fitstatistics = &dsn._dm_fitstat(where=(descr="-2 Res Log Likelihood") rename=(value=full_loglik));
ods output Dimensions = &dsn._dm_dim(rename=(Descr=Descr1 value=full_dim)where=(Descr1="Covariance Parameters"));

proc mixed data = &dsn noitprint noclprint update;
by trait;
class trial rep gen;
model y = trial gen gen*trial/ddfm = satterth;
random rep(trial);
repeated /group = trial;
where trait in("dm");
run;
quit;

Re: Covariance Parameter Values At Last Iteration

unison — Sun, 10 Nov 2019 15:15:20 GMT

One route might be adjusting the default tolerance up so that you get convergence (convf, convg or convh options)?

https://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/viewer.htm#statug_mixed_sect008.htm#statug.mixed.procstmt_convf

-unison

topic Re: Covariance Parameter Values At Last Iteration in SAS Programming

Covariance Parameter Values At Last Iteration

Re: Covariance Parameter Values At Last Iteration