na.tree.replace function

Replace NAs in Predictor Variables

Adds a new level called "NA" to any discrete predictor in a data frame that contains NAs. Stops if any continuous predictor contains an NA.

na.tree.replace(frame)

Arguments

• frame: data frame used to grow a tree.

Returns

data frame such that a new level named "NA" is added to any discrete predictor in frame with NAs.

Details

This function is used via the na.action argument to tree.

See Also

tree, na.omit.