Find out which predictor variables are actually used in the random forest.
varUsed(x, by.tree=FALSE, count=TRUE)
An object of class randomForest
.
Should the list of variables used be broken down by trees in the forest?
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.
# NOT RUN { data(iris) set.seed(17) varUsed(randomForest(Species~., iris, ntree=100)) # }