I am using proc genmod for binary longitudinal data. SAS code and error message listed below. Does this means I need exclude all the subjects which have missing measurements at any time point? Thanks for your help.
proc genmod data=ee descending;
class subjID sex time group;
model response_var=Sex group Weight /dist=bin link=logit;
repeated subject=subjID / withinsubject=time logor=exch;
ERROR: There seems to be a problem in the WITHINSUBJECT effect data. Check to see that there are at least as many levels of the WITHINSUBJECT effect as there are measurements for each subject.