predict.TreeSurrogate function

Predict Tree Surrogate

Predict the response for newdata of a TreeSurrogate object.

This function makes the TreeSurrogate object call its internal $predict() method.

## S3 method for class 'TreeSurrogate'
predict(object, newdata, type = "prob", ...)

Arguments

• object: The surrogate tree. A TreeSurrogate object.
• newdata: A data.frame for which to predict.
• type: Either "prob" or "class". Ignored if the surrogate tree does regression.
• ...: Further arguments for predict_party.

Returns

A data.frame with the predicted outcome. In case of regression it is the predicted $\hat{y}$. In case of classification it is either the class probabilities (for type "prob") or the class label (type "class")

Examples

library("randomForest")
# Fit a Random Forest on the Boston housing data set
data("Boston", package = "MASS")
rf <- randomForest(medv ~ ., data = Boston, ntree = 50)
# Create a model object
mod <- Predictor$new(rf, data = Boston[-which(names(Boston) == "medv")])

# Fit a decision tree as a surrogate for the whole random forest
dt <- TreeSurrogate$new(mod)

# Plot the resulting leaf nodes
predict(dt, newdata = Boston)

See Also

TreeSurrogate