I'm running a 3- level multilevel regression model using proc glimmix and one of the classes is HPSU so when i run the following code the estimate for HPSU random effect is 9.13E-11 and the standard error is zero. Is there something i'm missing? Here is the code I'm using: PROC GLIMMIX DATA=DIRT METHOD=LAPLACE ; CLASS HPSU HNUMBER; MODEL HEPBRESF (EVENT=LAST) = / CL DIST=BINARY LINK=LOGIT ALPHA=0.1 SOLUTION ODDSRATIO (DIFF=FIRST LABEL) DDFM=BW ; WEIGHT HPWGT ; RANDOM INTERCEPT / SUBJECT=HPSU TYPE=VC SOLUTION CL ; RANDOM INTERCEPT / SUBJECT=HNUMBER (HPSU) TYPE=VC SOLUTION CL ; COVTEST / WALD; RUN;
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