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...roup), data=mydata) This messes up the character string matching for strata, done via tt <- terms(formula, specials= ?strata?). The code runs, and gives the wrong answer (group is treated as an ordinary covariate). The solution 1. Add code very early that rewrites the formula without the offendinge survival:: string 2. Before calling model.frame(), insert my copy of strata into the calling chain coxenv <- new.env(parent= environment(formula)) assign("strata", survival::strata, envir= coxenv) environment(formula) <- coxenv The second part of this deals with thos...