[R] percent inclusion in cph

Dear R-help, I have to calculate the percent inclusion of each variable in a bootstrap validation of a cox proportional hazards model(described in Sauerbrei and Schumacher, Stat Med 11:1093, 1992). First I need to get a bootstrap sample from my dataset, which I did with the sample function. Th

[R] percent inclusion in cph

Dear R-help, I have to calculate the percent inclusion of each variable in a bootstrap validation of a cox proportional hazards model(described in Sauerbrei and Schumacher, Stat Med 11:1093, 1992). First I need to get a bootstrap sample from my dataset, which I did with the sample function. Th