If you are interested in using bp to predict illness, just invert what @StatDave gave you.
proc gee;
class group id;
model group=bp|time/dist=binomial;
repeated subject=id*group;
run;
In this case, bp and time are used to predict group membership. There should be some diagnostics that tell how good of a predictor bp is, but we are outside my comfort zone.
SteveDenham
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