Dear R users,

I tried to fit a cox proportional hazard model to get estimation of stratified survival probability. my R code is as follows:

cph(Surv(time.sur, status.sur)~ strat(colon[,13])+colon[,18] +colon[,20]+colon[,9], surv=TRUE)
Error in if (!length(fname) || !any(fname == zname)) { : 
        missing value where TRUE/FALSE needed
Here colon[,13] is the one that I want to stratify and the others are all coefficients. How can I solve this problem?  Thanks a lot!!!!!

Grace

       
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