Hi- when I run summary on this model output, I just get this giant set of matrices rather than the summary of the model. r3<-zelig(wrongright3~mean.firstatt , model="probit.gee", robust=TRUE, id="student", corstr = "exchangeable", data=m) Further, the sim function still appears to not support case wise deletion of missing data...it just throws an error that doesn't tell you that that is what the problem is. Dustin Dustin Tingley Government Department Harvard University http://scholar.harvard.edu/dtingley Director, Program on Experience Based Learning in the Social Sciences http://projects.iq.harvard.edu/peblss/ Contribute to the Research Reservoir: http://projects.iq.harvard.edu/undergradscholars/pages/research-resources - -- Zelig Mailing List, served by HUIT Send messages: zelig(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/mailman/listinfo/zelig Zelig program information: http://gking.harvard.edu/zelig/ Zelig mailing list Zelig(a)lists.gking.harvard.edu To unsubscribe from this list or get other information: https://lists.gking.harvard.edu/mailman/listinfo/zelig