Hello all - I was wondering if I could pick your collective brain about approximating a subdomain analysis using proc glimmix. I am conducting multilevel modeling of a complex probability survey using proc glimmix. I am able to do an overall analysis just fine, using the weight option to specify weights on my two levels of interest. However, I am unable to figure out how to replicate my analysis for a particular subpopulation within my overall dataset. I know that i can't just subset my dataset, and that proc glimmix DOES have a BY statement option (and not a domain statement) - and i know that using the BY statement is not considered exactly 'proper' from a technical point of view. But I don't know WHY that is the case - Would you mind helping me better understand why using the BY statement option is not appropriate for conducting domain analyses with proc glimmix? Is there anything else you'd recommend I try instead? Your advice, especially if accompanied by references I could consult, would be extremely helpful. Thanks so much!
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