model_performance: Model performance for survival models

In survxai: Visualization of the Local and Global Survival Model Explanations

Description

Function model_performance calculates the prediction error for chosen survival model.

Usage

model_performance(explainer, type = "BS")

Arguments

explainer	a model to be explained, preprocessed by the 'survxai::explain' function
type	character - type of the response to be calculated Currently following options are implemented: 'BS' for Expected Brier Score

Details

For type = "BS" prediction error is the time dependent estimates of the population average Brier score. At a given time point t, the Brier score for a single observation is the squared difference between observed survival status and a model based prediction of surviving time t.

References

Ulla B. Mogensen, Hemant Ishwaran, Thomas A. Gerds (2012). Evaluating Random Forests for Survival Analysis Using Prediction Error Curves. Journal of Statistical Software, 50(11), 1-23. URL http://www.jstatsoft.org/v50/i11/.

Examples

   library(survxai)
   library(rms)
   data("pbcTrain")
   data("pbcTest")
   cph_model <- cph(Surv(years, status)~ sex + bili + stage,
     data=pbcTrain, surv=TRUE, x = TRUE, y=TRUE)
   surve_cph <- explain(model = cph_model, data = pbcTest[,-c(1,5)],
                        y = Surv(pbcTest$years, pbcTest$status))
   mp_cph <- model_performance(surve_cph)

survxai documentation built on Aug. 28, 2020, 5:07 p.m.