I am trying to run the following program for analysis of repeated measures multinomial data. proc gee data=ironstat4; class tovid anemia_type baseline_anemia_type time_ ; model anemia_type=baseline_anemia_type / dist=multinomial link=glogit; repeated subject=tovid /within=time; run; subjects are uniquely identified via the variable "tovid". I have three repeated assessments with periods of assessment represented by "time_). I simply don't understand this error and/or what I can do to resolve it. I'd appreciate any thoughts to help me move forward.
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