Hi there, Is it possible that when changing from param=ref to param=glm the model experiences convergence issues? Here's my original code: proc genmod data=in.final; class link_id agec (param=ref ref='1') sexf (param=ref ref='1') eth_f (param=ref ref='1') year (param=ref ref=last) poly_meds_anyF (param=ref ref="0") Cluster (param=ref ref=last) imd_local_quintile_f(param=ref ref=last) lang_F (param=ref ref='E'); model total_cons=sexf agec eth_f Cluster countltcs Cluster*countltcs imd_local_quintile_f poly_meds_anyF year lang_F /dist=negbin; repeated subject=link_id / type=AR(1) covb corrw; store out=catcont; run; Here's the param=glm code: proc genmod data=in.final; class link_id agec sexf eth_f year poly_meds_anyF Cluster imd_local_quintile_f lang_F/param=glm; model total_cons=sexf agec eth_f Cluster countltcs Cluster*countltcs imd_local_quintile_f poly_meds_anyF year lang_F /dist=negbin; repeated subject=link_id / type=AR(1) covb corrw; store out=catcont; run; Thanks very much, Marina
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