The combination of survfit, coxph, and factors is getting confused. It is
not smart enough to match a new data frame that contains a numeric for sitenew
to a fit that contained that variable as a factor. (Perhaps it should be smart
enough to at least die gracefully -- but it's not).
The
On Mon, 7 May 2007, Terry Therneau wrote:
The combination of survfit, coxph, and factors is getting confused. It is
not smart enough to match a new data frame that contains a numeric for sitenew
to a fit that contained that variable as a factor. (Perhaps it should be
smart
enough to at
I am trying to use the survfit() function with the newdata argument to
produce predicted survivor curves for a particular covariate profile.
The main purpose of the plot will be to visualise the effect of snp1,
coded 0 and 1. In my Cox model I have stratified by one variable, edu, and
so I
