Replace `NA's in Predictor Variables
Usage
na.tree.replace(frame)
Arguments
frame
|
data frame used to grow a tree.
|
Description
Adds a new level called "NA"
to any discrete predictor in a data frame that
contains NA
s. Stops if any continuous predictor contains an NA
.Details
This function is used via the na.action
argument to tree
.Value
data frame such that a new level named "NA"
is added to any discrete
predictor in frame
with NA
s.See Also
tree
, na.omit
.Examples
z <- tree(market.survey, na.action=na.tree.replace)