[R] expected risk from coxph (survival)

Dieter Menne dieter.menne at menne-biomed.de
Sat Jun 7 10:15:48 CEST 2008

Reid Tingley <r_tingley <at> hotmail.com> writes:
> When I try to to obtain the expected risk for a new dataset using coxph in the
survival package I get an error.
> Using the example from ?coxph:

# Example rewritten by DM; please do not use HTML mail
test1 <- list(time=  c(4, 3,1,1,2,2,3),
            x=     c(0, 2,1,1,1,0,0),
            sex=   c(0,0,0,0,1,1,1))
cox<-coxph( Surv(time, status) ~ x + strata(sex), test1)  #stratified model
new<-list(time=  c(5, 1,1,2,2,4,3),
          x=     c(0, 2,1,1,1,0,0),
          sex=   c(0,0,0,0,1,1,1))

 #   }
#    else if (type == "expected") {
#        if (missing(newdata)) 
#            pred <- y[, ncol(y)] - object$residuals
#        else stop("Method not yet finished")
Looks like this is "by design"; see the code above.

You might try to use cph and predict.Design from Frank Harrell's Design package


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