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Thanks David. Could you show me how to do that in my example ? Thanks, Meghna > On Nov 6, 2017, at 12:58 AM, David Winsemius <dwinsemius at comcast.net> wrote: > > You should stop trying to use matrices on the RHS and using separate vectors to Surv. Instead use a data argument and have the names in your formula refer to column names. > > ? > David > > Sent