importance {randomForest}R Documentation

Extract variable importance measure

Description

This is the extractor function for variable importance measures as produced by randomForest.

Usage

## S3 method for class 'randomForest':
importance(x, type=2, class, ...)

Arguments

x an object of class randomForest
type either 1 or 2, specifying the type of importance measure (1=mean decrease in accuracy, 2=mean decrease in node impurity).
class for classification problem, which class-specific measure to return.
... not used.

Details

See the documentation for randomForest for explanation of how the importance measures are computed.

Value

A (named) vector of importance measure, one for each predictor variable.

See Also

randomForest, var.imp.plot


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