Variables used in a random forest
Find out which predictor variables are actually used in the random forest.
varUsed(x, by.tree=FALSE, count=TRUE)
x |
An object of class |
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? |
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.
Andy Liaw
data(iris) set.seed(17) varUsed(randomForest(Species~., iris, ntree=100))
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