Re: [R] C-statistic comparison with partially paired datasets

2009-08-13 Thread Frank E Harrell Jr
Hanneke Wijnhoven wrote: Frank, Thank you for your quick response! I want to compare the discriminative capacity of different anthropometric measures in predicting mortality, focussing on the thin site of these measures. Since these associations are not linear (U shaped for BMI and inversily

Re: [R] C-statistic comparison with partially paired datasets

2009-08-13 Thread hwijnh
Frank, thank you very much for your answer. Yes, I also estimated splines like you suggested but wanted to add more custom analyses as well. Your answer does help me however, thanks. Hanneke Hanneke Wijnhoven wrote: Frank, Thank you for your quick response! I want to compare the

[R] C-statistic comparison with partially paired datasets

2009-08-12 Thread Hanneke Wijnhoven
Does anyone know of an R-function or method to compare two C-statistics (Harrells's C - rcorr.cens) obtained from 2 different models in partially paired datasets (i.e. some similar and some different cases), with one continuous independent variable in each separate model? (in a survival

Re: [R] C-statistic comparison with partially paired datasets

2009-08-12 Thread Frank E Harrell Jr
Hanneke Wijnhoven wrote: Does anyone know of an R-function or method to compare two C-statistics (Harrells's C - rcorr.cens) obtained from 2 different models in partially paired datasets (i.e. some similar and some different cases), with one continuous independent variable in each separate

Re: [R] C-statistic comparison with partially paired datasets

2009-08-12 Thread Hanneke Wijnhoven
Frank, Thank you for your quick response! I want to compare the discriminative capacity of different anthropometric measures in predicting mortality, focussing on the thin site of these measures. Since these associations are not linear (U shaped for BMI and inversily J-shaped for mid-upper