[amelia] 1) subsets 2) lags

Dear all, I have two questions and would be very grateful for your help: 1) Is there a problem with running imputations on different subsets of your full data set when I use the same variables in my models from different imputations? 2) Do I have to include lags in the imputation specification that I expect I 'might' use in my models (although I'm not sure yet)? For example, all independent variables 'might' be lagged one year to allow for their effect to 'spread' to the outcome variable. If I don't include them and decide to use lags after a first run of imputations, do I have to go back to Amelia, include the lags, and run it again? Best, Nicole Nicole Janz, PhD Cand. Lecturer at Social Sciences Research Methods Centre 2012/13 University of Cambridge Department of Politics and International Studies www.nicolejanz.de | nj248(a)cam.ac.uk | Mobile: +44 (0) 7905 70 1 69 4 Skype: nicole.janz