[Rd] Request to review a patch for rpart
Kirill Müller
kirill.mueller at ivt.baug.ethz.ch
Fri Aug 15 19:55:00 CEST 2014
Gabriel
Thanks for your feedback. Indeed, I was not particularly clear here. The
empty model is just a very special case in a more general setting. I'd
have to work around this deficiency in my code -- sure I can do that,
but I thought a generic solution should be possible. In particular, I'm
using predict.rpart(..., type = "prob") -- this just reflects the
observed relative frequencies.
Cheers
Kirill
On 08/15/2014 06:44 PM, Gabriel Becker wrote:
> Kirill,
>
> 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.
>
> ~G
>
>
> On Wed, Aug 13, 2014 at 3:51 AM, Kirill Müller
> <kirill.mueller at ivt.baug.ethz.ch
> <mailto: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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