[amelia] Error with nominal variable

Hi, Could anyone help me with the following error message? **** There was an unexpected error in the execution of Amelia. Double check all inputs for errors and take note of the error message: Error in apply(data[, noms], 2, function(t) length(unique(na.omit(t)))) : dim(X) must have a positive length **** I try to impute several variables among which only one variable is nominal. Kind regards, Stijn -- Stijn Ruiter Department of Sociology Radboud University Nijmegen P.O. Box 9104 6500 HE Nijmegen Netherlands Phone: + 31 24 361 2272 Fax: + 31 24 361 2399 Visiting address: Thomas van Aquinostraat 4.01.74 Nijmegen website: http://oase.uci.ru.nl/~sruiter - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia