Wednesday, March 21, 2007

Multiple imputation with growth modeling

Several days ago, a new user-contributed Stata module "MIM" appears in the Stata software repository. This module can automate the process of combing estimates from multiply imputed data sets and calculating confidence intervals for a wide array of Stata estimation commands, including "XTMIXED". This means that the complete process of imputation, estimation, and post-estimation can be done without leaving Stata.

Saturday, March 10, 2007

Multiple imputation with longitudinal data

Have been working with Sarah on revising our comparative paper. One problem we need to solve in this revision is the presence of large amount of missing values. I use "ICE", a user contributed module in Stata to do the imputation. Unfortunately, the built-in estimation procedures does not include "XTMIXED" or "GLLAMM". I have to import the imputed data sets into Mplus and do the estimation there.