Greetings, I am attempting to run a gamma.mixed model on five imputed datasets from Amelia II. I used mi() to combine the datasets in the zelig run. As with some others, when I call the summary () , I receive the error *Error in object[[1]]$result$call : $ operator not defined for this S4 class* I can get the summaries for each individual dataset,but I cannot retrieve the summary of the combined datasets. I can combine the datasets using Rubin's rules, but given this analysis will use several different models and plots, having the combined results would be far simpler. Thanks, David David Hill Associate Professor of Political Science Stetson University DeLand, FL 32723 (386) 822-7579