1. I haven't seen that particular message before, so it is difficult to comment.
2. To go further, you will need to provide a reproducable example, i.e., some
code/data that I could run to get the same error.
3. One note
cox.NV <- coxph(Surv(recidivism$intDaysUntilFNVPO,
recidivism$Event_nv) ~ recidivism$strGender +
recidivism$intAgeAtMHCIndex + recidivism$PRE.nv + group +
recidivism$MHC.nv + recidivism$SNFP , data = recidivism)
would be much simpler to type as
cox.NV <- coxph(Surv(intDaysUntilFNVPO, Event_nv) ~ strGender +
intAgeAtMHCIndex + PRE.nv + group + MHC.nv + SNFP ,
data = recidivism)
(That is one purpose of the data= argument, to make it simpler.)
Terry Therneau
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