[R] Accessing terminal datasets in Ctree()

[Preetam Pal]

Great, thank you so much Achim.
But one issue, in case I do not know how many terminal nodes would be
there, what do I do? Note that I do not need the datasets corresponding to
the intermediate nodes only need the terminal datasets.
Regards,
Preetam

On Tue, May 3, 2016 at 3:08 AM, Achim Zeileis <Achim.Zeileis at uibk.ac.at>
wrote:

> On Mon, 2 May 2016, Preetam Pal wrote:
>
> Hi guys,
>>
>> If I am applying ctree() on a data (specifying some control parameters
>> like
>> maxdepth), is there a way I can programmatically access the (smaller)
>> datasets corresponding to the terminal nodes in the tree? Say, if there
>> are
>> 7 terminal nodes, I need those 7 datasets (of course, I can look at the
>> respective node-splitting attributes and write out a filtering function -
>> but clearly too much to ask for if I have a large number of terminal
>> nodes). Intention is to perform regression on each of these terminal
>> datasets.
>>
>
> If you use the "partykit" implementation you can do:
>
> library("partykit")
> ct <- ctree(Species ~ ., data = iris)
> data_party(ct, id = 6)
>
> to obtain the data associated with node 6 for example. You can also use
> ct[6] to obtain the subtree and ct[6]$data for its associated data.
>
> For setting up a factor with the terminal node IDs, you can also use
> predict(ct, type = "node") and then use that in lm() etc.
>
> Finally, note that there is also lmtree() and glmtree() for trees with
> (generalized) linear models in their nodes.
>
> Regards,
>> Preetam
>>
>> --
>> Preetam Pal
>> (+91)-9432212774
>> M-Stat 2nd Year,                                             Room No.
>> N-114
>> Statistics Division,                                           C.V.Raman
>> Hall
>> Indian Statistical Institute,                                 B.H.O.S.
>> Kolkata.
>>
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>>
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>>


-- 
Preetam Pal
(+91)-9432212774
M-Stat 2nd Year,                                             Room No. N-114
Statistics Division,                                           C.V.Raman
Hall
Indian Statistical Institute,                                 B.H.O.S.
Kolkata.

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