topic Re: PROC GEE ERROR: within effect should be unique in Statistical Procedures

PROC GEE ERROR: within effect should be unique

AmaraEzeamama — Fri, 31 Aug 2018 15:40:25 GMT

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.

Re: PROC GEE ERROR: within effect should be unique

Reeza — Fri, 31 Aug 2018 17:06:14 GMT

Do you have duplicates within subject and time?

You can run a proc freq to check that.

proc freq data=ironstat4;
table tovid*time / out=check (where=(count>1));
run;

If the data set named CHECK is empty it's something else. If not, those records have duplicates for subject time.

@AmaraEzeamama wrote:

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.

Re: PROC GEE ERROR: within effect should be unique

AmaraEzeamama — Fri, 31 Aug 2018 17:16:58 GMT

Thank you Reeza: This check allowed me to solve the problem. So thankful for your assistance!