I just came across this thread and wanted to chime in on the use of the ParameterEstimates table with Proc Genmod in a Multiple Imputation analysis. The ParameterEstimates table gives the initial parameter estimates.  That is, from an MLE procedure ignoring the correlation in the data.  Proc Genmod uses these parameter estimates as initial values in the GEE procedure, which correctly accounts for the correlation when the "repeated" statement is used.  Long story short, when a repeated statement is used you SHOULD NOT use the ParameterEstimates table as the input into proc mianalyze.  These estimates ignore the correlation structure, and the GEEEmpPEst table should be used.  Same with the COVB table (this is from the initial MLE procedure), instead use the GEERCov as the input into mianalyze.  The COVB will significantly underestimate the variances. -Alex Alexander C. McLain, Ph.D. Assistant Professor Department of Epidemiology and Biostatistics Arnold School of Public Health University of South Carolina Phone: (803) 777-1124 Website: https://sites.google.com/site/alexmclain/home ... View more