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Problems with coxph and survfit in a stratified model with interactions

rm 
I?m trying to set up proportional hazard model that is stratified with
respect to covariate 1 and has an interaction between covariate 1 and
another variable, covariate 2. Both variables are categorical. In the
following, I try to illustrate the two problems that I?ve encountered, using
the lung dataset.



The first problem is the warning:



To me, it seems that there are too many dummies generated.

The second problem is the error:






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rm Problems with coxph and survfit in a stratified model with interactions Oct 13 rm Problems with coxph and survfit in a stratified model with interactions Oct 14 Chris Andrews Problems with coxph and survfit in a stratified model with interactions Oct 15 rm Problems with coxph and survfit in a stratified model with interactions Oct 15 Andrews, Chris Problems with coxph and survfit in a stratified model with interactions Oct 16 rm Problems with coxph and survfit in a stratified model with interactions Oct 17