randomForest (version 4.0-7)

importance: 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.

Value

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

Details

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

See Also

randomForest, var.imp.plot