Dear R users,
I am trying to fit a Cox model such as:
Surv(time,event) ~ X1+X1:X2
or
Surv(time,event) ~ X1*X2 -X2,
This code is working with coxph but not with cph (nor with psm), and the error
message is:
Error in if (!length(fname) || !any(fname == zname)) { :
missing value where TRUE/FALSE is required
Any idea about the cause of the problem and how to manage it within the Design
library?
Thanks a lot for your help.
Rosalba
Dr. Rosalba Miceli
Unità di Statistica Medica e Biometria
Fondazione IRCCS Istituto Nazionale Tumori
Via G. Venezian, 1
20133 Milan (Italy)
Tel: +39 2 23903198 / 23902456
Fax: +39 2 23902095
E-Mail: [EMAIL PROTECTED]
<www.istitutotumori.mi.it/biometria>
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