plot.proximity {randomSurvivalForest}R Documentation

Plot of Proximity

Description

Multidimensional scaling plot of proximity matrix.

Usage

    plot.proximity(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

Extracts proximity information from x and converts it to a symmetric proximity matrix. Dissimilarities between points are converted into distances using the R multidimensional scaling function cmdscale and then plotted. Overlayed on the plot are mortality values, rescaled from 1-100, with 1 indicating low mortality, and 100 indicating high mortality. Mortality values will be well separated in successful analyses.

Value

Invisibly, the proximity matrix.

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.

See Also

rsf, print.rsf, plot.ensemble, plot.variable, plot.error, cmdscale.

Examples

  data(pbc, package = "randomSurvivalForest") 
  pbc.prox.out <- rsf(Survrsf(days,status)~., pbc, ntree = 1000,
                      proximity = TRUE)
  plot.proximity(pbc.prox.out)

[Package randomSurvivalForest version 1.0.0 Index]