From a theoretical point of view, yes you should one-hot-encode your categorical variables if you don't want any ordering to be implied. 

Brian

On 29 Mar 2017 08:40, "Andrew Howe" <ahowe42@gmail.com> wrote:
My question is more along the lines of will the DT classifier falsely infer an ordering?

<~~~~~~~~~~~~~~~~~~~~~~~~~~~>
J. Andrew Howe, PhD
https://www.researchgate.net/profile/John_Howe12/
I live to learn, so I can learn to live. - me
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On Wed, Mar 29, 2017 at 10:32 AM, Olivier Grisel <olivier.grisel@ensta.org> wrote:
For large enough models (e.g. random forests or gradient boosted trees
ensembles) I would definitely recommend arbitrary integer coding for
the categorical variables.

Try both, use cross-validation and see for yourself.

--
Olivier
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