[amelia] Question about analysis of imputed data

Hello, I'm using site dummies in lieu of fixed effects and the "miest" command in Stata. When I do this, I get a "conformability" error. I am pretty sure is a consequence of different sites being dropped from different imputed datasets when I run the logit model. For example, the imputation process generated a situation in which site A is dropped from the analysis in imputed dataset 1 because there is no variation on the dependent variable for site A in dataset 1. However, for dataset 2, the imputation process generated variation in the dependent variable for site A, so site A is not dropped from that analysis. Then, when "miest" attempts to combine the coefficients and standard errors from the imputed datasets, it is doing so with different matrices and running into problems. Since I don't really care about the coefficients for the site dummies, can I just run the regressions one at a time on each of the imputed datasets and then manually combine the coefficients on the variables with which I am concerned? I understand it is necessary to sum the within and between variance to get proper standard errors; my question is whether the fact that different sites will be dropped from different analyses invalidates the combining of the coefficients and their standard errors. Thanks to anyone who can help. Steve Shewfelt PhD Candidate Department of Political Science Yale University - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia More info about Amelia: http://gking.harvard.edu/amelia