importance.gradientForest: Importance of the variables in a 'gradientForest' or...

In slarge/gradientForest: Random Forest functions for the Census of Marine Life synthesis project.

Description

Compute the importance measures as a named vector

Usage

## S3 method for class 'gradientForest'
importance(x, type = c("Accuracy", "Impurity", "Weighted", "Raw", "Species")[3], 
sort = TRUE, ...)

Arguments

x	an object of class gradientForest, resulting from a call to gradientForest
type	the type of importance measure. For type="Species" the importance measure is the R^2 value for each species.
sort	if TRUE sort the result in decreasing order
...	further arguments for other methods

Value

a named vector of importance measures, one for each variable (or species), possibly sorted

Author(s)

Original code written by N. Ellis, CSIRO, Cleveland, Australia. <[e-mail]>. Modified by S.J. Smith, DFO, Dartmouth, NS, Canada. <[e-mail]>

Examples

data(CoMLsimulation)
preds <- colnames(Xsimulation)
specs <- colnames(Ysimulation)
f1 <- gradientForest(data.frame(Ysimulation,Xsimulation), preds, specs[1:6], ntree=10)
f2 <- gradientForest(data.frame(Ysimulation,Xsimulation), preds, specs[1:6+6], ntree=10)
f12 <- combinedGradientForest(west=f1,east=f2)
importance(f1)
importance(f1, "Species")
importance(f2, "Impurity")

slarge/gradientForest documentation built on May 3, 2019, 4:05 p.m.