Thank you very much for getting back to me on the issue. I really need some help or someone to brainstorm with. The numbers for pneumonia, cold and flu represent the ratio of number of each pneumonia, cold or flu cases over the total population lived in the geographic area. RH and temp are related. Also, considering a combined effect of RH and temp is important. I was wondering about creating a simple interaction variable like: min_temp*avg_relative_humidity. I noticed that you didn't comment on the proc varmax, would you recommend proc varmax? or other proc is in consideration depending how complex the relationship under assessment, as you are hinting?
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