[amelia] Incomplete imputation

Hello, I am trying to impute missing values for a dataset with 1752 observations. I've tried several times with different combinations of variables included in the imputation, and the problems described here occur in exactly the same way every time. First, there are several variables for which the imputation does not occur. That is, for a handful of variables, there are the same number of missing values in the output datasets as there are in the input. This only happens for a handful of the variables, but it is the same ones every time. I've looked at these variables both in their original format (stata) and in the "summarize" feature in AmeliaView, and can't detect anything different about them compared to all the other variables. Second, there are a few other variables that I assigned to have an ordinal output but for which the output is a near-zero number (2e-17). Again, it is the same variables every time. This problem seems less significant, as I can just change these to zeros. Any suggestions on what might be causing this or what I can do about it would be welcome. Thank you, Steve Shewfelt - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia