varUsed
From randomForest v4.612
by Andy Liaw
Variables used in a random forest
Find out which predictor variables are actually used in the random forest.
 Keywords
 tree
Usage
varUsed(x, by.tree=FALSE, count=TRUE)
Arguments
 x
 An object of class
randomForest
.  by.tree
 Should the list of variables used be broken down by trees in the forest?
 count
 Should the frequencies that variables appear in trees be returned?
Value

If
count=TRUE
and by.tree=FALSE
, a integer vector containing
frequencies that variables are used in the forest. If
by.tree=TRUE
, a matrix is returned, breaking down the counts by
tree (each column corresponding to one tree and each row to a variable).If count=FALSE
and by.tree=TRUE
, a list of integer
indices is returned giving the variables used in the trees, else if
by.tree=FALSE
, a vector of integer indices giving the
variables used in the entire forest.
See Also
Examples
library(randomForest)
data(iris)
set.seed(17)
varUsed(randomForest(Species~., iris, ntree=100))
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