[amelia] A question about amelia for gauss to impute multiparty data

Dear Amelia users, I use Amelia for Gauss to input missing obs in multiparty votes. I have problem in putting data in Gauss. Since I'm not a Gauss user and use Gauss this time first, I may make dumb mistakes. My data(vote) look like these; ----------------------------------------------------------------------------- party1 party2 party3 party1(t-1) party2a(t-1) party2b(t-1) party3(t-1) 0.52 0.43 0.04 0.41 0.33 0.17 0.06 0.46 0.51 0.00(missing)0.53 0.43 0.03 0.00 ---------------------------------------------------------------------------- Party1 is the reference party and party 2 and 3 have missing values. So I use following command; new; library amelia; load X[ ] = c:\data\newelecg.txt; # call data vote = reshape(X, 225, 7); # make data as matrix vote = vote[2:225,.]; # delete vnames _AMempri=3; # use ridge prior _AMkknp=3; # number of parties _AMkkpfo= 1; # position of the reference party _AMemt = 1; # use t-distributed ECME algorithm dbuf = amelia(vote); And I got the next error message. ---------------------------------------------- Invalid input, program ended due to input error: Variable in dataset is either a constant or completely unobserved. Delete this variable and rerun Amelia. Math coprocessor exceptions: Invalid Operation Missing values may have been encountered ---------------------------------------------- Could somebody tell me what's wrong with my command and how can I fix it? Thank you in advance. Jong Hee Park Department of Political Science Washington University in St.Louis Campus Box 1063 One Brookings Drive St. Louis, MO 63130 Office Phone: (314) 935-6764