Re: [R] C-index and Cox model

Bessy wrote: > Dear all R users, > > I am building a Cox PH model on a small dataset. I am wondering how to > measure the predictive power of my cox model? Normally the ROC curve or Gini > value are used in logistic regression model. Is there any similar > measurement suitable for Cox model? > >

Re: [R] C-index and Cox model

Bessy wrote: Dear all R users, I am building a Cox PH model on a small dataset. I am wondering how to measure the predictive power of my cox model? Normally the ROC curve or Gini value are used in logistic regression model. Is there any similar measurement suitable for Cox model? Also if I use

[R] C-index and Cox model

Dear all R users, I am building a Cox PH model on a small dataset. I am wondering how to measure the predictive power of my cox model? Normally the ROC curve or Gini value are used in logistic regression model. Is there any similar measurement suitable for Cox model? Also if I use C-index statis

Re: [R] c-index validation from Design library

Juliet Hannah wrote: Hi Group, I have a question about obtaining the bias-corrected c-index using validate from the Design library. As an example, consider the example from help page: library(Design) ?validate.lrm n <- 1000 age<- rnorm(n, 50, 10) blood.pressure <- rnorm(n, 120, 15

[R] c-index validation from Design library

Hi Group, I have a question about obtaining the bias-corrected c-index using validate from the Design library. As an example, consider the example from help page: library(Design) ?validate.lrm n <- 1000 age<- rnorm(n, 50, 10) blood.pressure <- rnorm(n, 120, 15) cholesterol<- rno

Re: [R] C-index for models fitted using start, stop in Surv?

One of my colleagues has written a technical report on how to do this, but I have not yet implemented it in the survival package. Terry Therneau http://mayoresearch.mayo.edu/mayo/research/biostat/techreports.cfm #80 Concordance for Survival Time Data: Fixed and Time-Depende

Re: [R] C-index for models fitted using start, stop in Surv?

223 740273 Strangeways Research Laboratory Department of Public Health and Primary Care University of Cambridge -Original Message- From: Frank E Harrell Jr [mailto:f.harr...@vanderbilt.edu] Sent: 25 February 2009 17:50 To: Eleni Rapsomaniki Cc: r-help@r-project.org Subject: Re: [R] C-index

Re: [R] C-index for models fitted using start, stop in Surv?

Eleni Rapsomaniki wrote: Dear R-users, One can use the rcorr.cens function in Design to compute the C index when only the stop time is indicated (I think implicitely start=0 in that case). When the start and stop times are used in a Surv object, e.g. library(Design) S=with(heart, Surv(start,s

[R] C-index for models fitted using start, stop in Surv?

Dear R-users, One can use the rcorr.cens function in Design to compute the C index when only the stop time is indicated (I think implicitely start=0 in that case). When the start and stop times are used in a Surv object, e.g. library(Design) S=with(heart, Surv(start,stop,event)) the object re

[R] c-index

I am using Cox regression to identify at risk groups. I have a training data set and a validation data set. How can I get the C-index in R? Any hint is highly appreciated. Thanks, Bereket [[alternative HTML version deleted]] __ R-help@r-project

Re: [R] C-index

bereket weldeslassie wrote: > Hi > > I am using Cox regression to identify at risk groups. How can I get the > C-index in R? > > Thanks, > > Bereket library(Hmisc) ?rcorr.cens # assumes no overfitting Also: library(Design) ?validate # penalizes for overfitting Frank > <'[EMAIL PROTECTED]'>

Re: [R] C-index

Hi > > I am using Cox PH regression using the coxph function to identify at risk > groups. How can I get the C-index (area under ROC curve) statistic in R? > > Thanks, > > Bereket > [[alternative HTML version deleted]] __ R-help@r-project.org

[R] C-index

Hi I am using Cox regression to identify at risk groups. How can I get the C-index in R? Thanks, Bereket [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the

[R] C-index

Hi I am using Cox regression to identify at risk groups. How can I get the C-index in R? Thanks, Bereket <'[EMAIL PROTECTED]'> [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-h