[Rd] Request to review a patch for rpart

Gabriel Becker gmbecker at ucdavis.edu
Fri Aug 15 18:44:52 CEST 2014


Perhaps I'm just being obtuse, but what are you proposing rpart do in the
case of an empty model?  Return a "tree" that always guesses the most
common label, or doesn't guess at all (NA)? It doesn't seem like you'd need
rpart for either of those.


On Wed, Aug 13, 2014 at 3:51 AM, Kirill Müller <
kirill.mueller at ivt.baug.ethz.ch> wrote:

> Dear list
> For my work, it would be helpful if rpart worked seamlessly with an empty
> model:
> library(rpart); rpart(formula=y~0, data=data.frame(y=factor(1:10)))
> Currently, an unrelated error (originating from na.rpart) is thrown.
> At some point in the near future, I'd like to release a package to CRAN
> which uses rpart and relies on that functionality. I have prepared a patch
> (minor modifications at three places, and a test) which I'd like to propose
> for inclusion in the next CRAN release of rpart. The patch can be reviewed
> at https://github.com/krlmlr/rpart/tree/empty-model, the files (based on
> the current CRAN release 4.1-8) can be downloaded from
> https://github.com/krlmlr/rpart/archive/empty-model.zip.
> Thanks for your attention.
> With kindest regards
> Kirill Müller
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Gabriel Becker
Graduate Student
Statistics Department
University of California, Davis

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