PROC GLIMMIX not converging! WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed.

Val40106 — Sun, 16 Nov 2014 16:20:58 GMT

Help!

PROC GLIMMIX IS NOT CONVERGING! I get an error message

WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the

covariance parameters failed. I first tried d=b link=clogit. My prof suggested deleting the d=b. My outcome is ordinal (1-4)

*****************ANALYSES*******************************;

PROC glimmix DATA=one order=data;

CLASS v6;

MODEL encourage= /SOLUTION link=clogit;

RANDOM intercept/SUBJECT=v6;

NLOPTIONS TECHNIQUE=NRRIDG;

weight v8;

TITLE 'STEP 1: RANDOM EFFECTS ANOVA';

run;

Re: PROC GLIMMIX not converging! WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed.

SteveDenham — Mon, 17 Nov 2014 14:38:11 GMT

Well, the obvious first step would be to apply a multinomial distribution (dist=mult, or d=mult, with link=clogit).

This worked for me in translating the example in the PROC GENMOD documentation (Example 43.4 Ordinal Model for Multinomial Data) to a GLIMMIX framework.

Steve Denham

topic PROC GLIMMIX not converging! WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed. in SAS Procedures

PROC GLIMMIX not converging! WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed.

Re: PROC GLIMMIX not converging! WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed.