subject:"\[R\] percent inclusion in cph"

Re: [R] percent inclusion in cph

2007-11-13 Thread Frank E Harrell Jr

sushi4u wrote: > 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). > This approach is not recommended. Collinearities can ruin the resul

[R] percent inclusion in cph

2007-11-12 Thread sushi4u

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

2007-11-12 Thread sushi4u

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