Dear allstatter, I would like to ask if anyone knows of any good references to goodness of fit or model checking methods for a Cox model with time-dependent covariates in survival analysis. I can fit this model in SAS, but would like to investigate how well the model fits the data. Any suggestions would be much appreciated. I'll summarise and post the responses to this list. Grace Grace PS Kwong Department of Infectious Disease Epidemiology Division of Primary Care and Population Health Sciences Faculty of Medicine Imperial College London Norfolk Place London W2 1PG Tel. :0207 5943248 (office) 0788 7926791 (mobile) email:[log in to unmask]