plot.error {randomSurvivalForest}R Documentation

Plot of Error Rate

Description

Plot out-of-bag (OOB) error rate for the ensemble as a function of number of trees in the forest.

Usage

    plot.error(x, main = deparse(substitute(x)), ...)

Arguments

x An object of class randomSurvivalForest, as that created by the function rsf.
main Plot title.
... Further arguments passed to or from other methods.

Details

Plot of OOB error rate for the ensemble, with the b-th value being the error rate for the ensemble formed using the first b trees. Error rate is 1-C, where C is Harrell's concordance index. Rates given are between 0 and 1, with 0.5 representing the benchmark value of a procedure based on random guessing. A value of 0 is perfect.

Author(s)

Hemant Ishwaran hemant.ishwaran@gmail.com and Udaya B. Kogalur ubk2101@columbia.edu

References

H. Ishwaran and Udaya B. Kogalur (2006). Random Survival Forests. Cleveland Clinic Technical Report.

F.E. Harrell et al. (1982). Evaluating the yield of medical tests, J. Amer. Med. Assoc., 247, 2543-2546.

See Also

rsf, print.rsf, plot.ensemble, plot.variable, plot.proximity.

Examples

  data(veteran, package = "randomSurvivalForest") 
  v.out <- rsf(Survrsf(time, status)~., veteran, ntree = 1000)
  plot.error(v.out, veteran)

[Package randomSurvivalForest version 1.0.0 Index]