search for: survivalroc

I have the same problem of a prevous request HOW to use the survivalROC (or another library in R) to get optimal cut-off values? I want to use the time-dependent survivalROC package.according to the,reference material,it only gives a set of ordered cut-off values .eg. -------------------------------------------------------------------------------- data(mayo) st...

I have the same problem of a previous request HOW to use the survivalROC (or another library in R) to get optimal cut-off values? I want to use the time-dependent survivalROC package.according to the,reference material,it only gives a partial set of ordered cut-off values .eg. -------------------------------------------------------------------------------- data(ma...

Dear R help My problem is very similar to the analysis detailed here. If we use the mayo dataset provided with the survivalROC package the estimate for Somer's Dxy is very negative -0.56. The Nagelkerke R2 is positive though 0.32. I know there is a difference between explained variation and predictive ability but I am surprised there is usch a difference given that even a non predictive model should have Dxy around 0....

...a la predicción nula (la diagonal en el espacio ROC). Según parece, tus datos son dinámicos (se repiten en intervalos para cada medida de FIshSpeed), y si lo que quieres es modelizar ROC dinámicas hay alternativas en R (pero este enfoque es mucho más complicado que el de ROC estática): - el paquete survivalROC http://cran.r-project.org/web/packages/survivalROC/survivalROC.pdf - y risksetROC http://cran.r-project.org/web/packages/risksetROC/risksetROC.pdf El siguiente artículo sobre pROC está muy bien para ver las capacidades de la librería: http://www.biomedcentral.com/1471-2105/12/77 #### con tus dat...

My question would be related more to time-dependent ROC (survivalROC package): I would like to know how true positives (TP) and false positives (FP) are related to the order of survival times and diagnostic markers. That is, having the a set of TP and FP, each of them is calculated from which diagnostic marker and survival times. Let's take mayo data set. How c...

...Thanks --- On Tue, 11/3/09, carol white <wht_crl at yahoo.com> wrote: > From: carol white <wht_crl at yahoo.com> > Subject: ROC > To: r-help at stat.math.ethz.ch > Date: Tuesday, November 3, 2009, 1:08 PM > My question would be related more to > time-dependent ROC (survivalROC package): > > I would like to know how true positives (TP) and false > positives (FP) are related to the order of survival times > and diagnostic markers. That is, having the a set of TP and > FP, each of them is calculated from which diagnostic marker > and survival times. Let...