I am a novice to proc glimmix and hierarchical models in general. I want to specify an independent covariance structure for the random effects. Is this the same as the default? i.e., type=VC. Also, if I have an exposure variable, how do I specify it? Any help would be appreciated - I'm a little over my head here. here is sample code:

ods graphics on; ods html file="z:\irb study\analysis\silent majority paper\output\protocol role.html"; proc glimmix data=irbstudy.meetings_all_participants6_30_10 plots=all; class sitepanel participantid protocolid protocol_role panel_role2; model turncount = panel_role2 protocol_role/solution dist=poisson; random intercept participantid protocolid/subject=sitepanel; format protocol_role protocol_role_r. panel_role2 panel_role_r.; title1 "IRB study"; title2 "GLIMMIX with sitepanel as subject"; run;ods graphics off;

also, I am still not getting any plots with these statements. I am getting titles for plots, but no plots.

Thanks all.