Hi, I am trying to calculate net reclassification improvement (NRI) and Inegrated Discrimination Improvement (IDI) for a survival dataset to compare 2 risk models. It seems that the improveProb() in Hmisc package does this only for binary outcome, while rcorrp.cens() does take survival object, but doesn't output NRI or IDI. Can anyone suggest any other packages that can calculate NRI and IDI for survival data? The reference for NRI extending to survival data is: Pencina MJ, D'Agostino RB, Steyerberg EW (2011): Extensions of net reclassification improvement calculations to measure usefulness of new biomarkers. Stat in Med 30:11-21 Thanks! John [[alternative HTML version deleted]]
Hello, I have no knowledge of survival data analysis. But I have some skill in using a web search engine: http://cran.r-project.org/web/views/Survival.html http://cran.r-project.org/web/packages/survIDINRI/index.html Regards, Pascal Le 28/11/2012 10:22, array chip a ?crit :> Hi, I am trying to calculate net reclassification improvement (NRI) and Inegrated Discrimination Improvement (IDI) for a survival dataset to compare 2 risk models. It seems that the improveProb() in Hmisc package does this only for binary outcome, while rcorrp.cens() does take survival object, but doesn't output NRI or IDI. Can anyone suggest any other packages that can calculate NRI and IDI for survival data? > > The reference for NRI extending to survival data is: > Pencina MJ, D'Agostino RB, Steyerberg EW (2011): Extensions of net > reclassification improvement calculations to measure usefulness of new > biomarkers. Stat in Med 30:11-21 > > Thanks! > > John > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >
On Nov 27, 2012, at 6:22 PM, array chip wrote:> Hi, I am trying to calculate net reclassification improvement (NRI) > and Inegrated Discrimination Improvement (IDI) for a survival > dataset to compare 2 risk models. It seems that the improveProb() in > Hmisc package does this only for binary outcome, while rcorrp.cens() > does take survival object, but doesn't output NRI or IDI. Can anyone > suggest any other packages that can calculate NRI and IDI for > survival data? > > The reference for NRI extending to survival data is: > Pencina MJ, D'Agostino RB, Steyerberg EW (2011): Extensions of net > reclassification improvement calculations to measure usefulness of new > biomarkers. Stat in Med 30:11-21I think that question has been answered before. Did you search the Archives? -- David Winsemius, MD Alameda, CA, USA