rpart.Defines the splitting function for a new splitting method of rpart.
Not to be called directly by the user.
survs(y, wt, x, parms, continuous)the response value as found in the formula that is passed in by rpart.
Note that rpart will normally
have removed any observations with a missing response.
the weight vector from the call, if any.
vector of x values.
the vector or list (if any) supplied by the user as a
parms argument to the call.
if TRUE the x variable should be treated as continuous.
The value of this parameter is determined by rpart automatically.
See reference.
https://cran.r-project.org/package=rpart/vignettes/usercode.pdf