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An rpart regression tree carries the deviance around (in the frame$dev element). This function computes the deviance for classification trees.
rp.deviance(x, ...)
An object of class rpart
Other arguments, currently unused.
Vector of deviances for every row in the tree's frame.
For a vector of leaf counts n whose sum is N, the deviance is (-2) times the sum of n log (n/N), taking 0 log 0 as 0.
rpart