A function that gives returns the RSS of a decision tree model.
A fitted rpart, gbm, or rf model
The Residuals Sums of Squares (RSS) for the models 'rpart', 'gbm.step', and 'randomForest'.
when using the 'caret' package, be sure to select 'model$finalModel' when entering it into the 'rss' function. Also note that the RSS only works for continuous variables.
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