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...= dated.sexrisk2, x=T,y=T,surv=T, time.inc=16) returns the error message Error in dimnames(X) <- list(rnam, c("(Intercept)", atr$colnames)) : length of 'dimnames' [2] not equal to array extent Using survreg{survival} for which psm is a wrapper, also runs perfectly on the unimputed dataset. Is this a bug, or am I doing something wrong? I particularly want to make use of Design's validation and calibration utilities on multiply imputed data. With many thanks for everyone's help David Foreman Consultant and Visiting Professor in Child and Adolescent Psychiatry [...