https://communities.sas.com/t5/SAS-Procedures/GEE-for-binary-longitudinal-data/m-p/70367#M20247 Hi, <BR /> 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.<BR /> <BR /> proc genmod data=ee descending;<BR /> class subjID sex time group; <BR /> model response_var=Sex group Weight /dist=bin link=logit;<BR /> repeated subject=subjID / withinsubject=time logor=exch;<BR /> run;<BR /> <BR /> 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. Tue, 20 Jan 2009 19:49:57 GMT deleted_user 2009-01-20T19:49:57Z https://communities.sas.com/t5/SAS-Procedures/GEE-for-binary-longitudinal-data/m-p/70367#M20247 Hi, <BR /> 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.<BR /> <BR /> proc genmod data=ee descending;<BR /> class subjID sex time group; <BR /> model response_var=Sex group Weight /dist=bin link=logit;<BR /> repeated subject=subjID / withinsubject=time logor=exch;<BR /> run;<BR /> <BR /> 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. Tue, 20 Jan 2009 19:49:57 GMT https://communities.sas.com/t5/SAS-Procedures/GEE-for-binary-longitudinal-data/m-p/70367#M20247 deleted_user 2009-01-20T19:49:57Z https://communities.sas.com/t5/SAS-Procedures/GEE-for-binary-longitudinal-data/m-p/70368#M20248 I was lucky because a search at support.sas.com pointed me to <A href="http://support.sas.com/kb/8/504.html" target="_blank">http://support.sas.com/kb/8/504.html</A> Wed, 21 Jan 2009 04:17:28 GMT https://communities.sas.com/t5/SAS-Procedures/GEE-for-binary-longitudinal-data/m-p/70368#M20248 deleted_user 2009-01-21T04:17:28Z