[R] RPart

[White.Denis@epamail.epa.gov]

> I am using the rpart package and seem to have trouble with data sets
that
> have columns with no data. I look at the column data in R and all
values are
> NA. When this occurs, I get nothing back from the rpart function. Is
there a
> way to get the rpart package to ignore these columns, without knowing
what
> columns are empty? I have tried the na.action=na.omit and
> na.action=na.exclude, but neither one fixes the problem.
> Thanks, Don

Either fill out the formula in the first argument to rpart() to exclude
those variables, or create a new data.frame without them.


-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._