[R] Automatic splitting/combining nested categorical variable in glm
Jan van der Laan
rhelp at eoos.dds.nl
Thu Apr 14 10:01:33 CEST 2011
I have a categorical variable with a nested structure. For example,
region: a country is split into parts, which in turn contain
provinces, which contain municipalities:
Part -> Province -> Municipality
What I would like to do is to automatically split/combine regions in a
forward (starting with parts and then splitting) or backward (starting
with municipalities and collapsing) manner. Do there exists methods
for this in R? Googling I couldn't find anything, but perhaps I have
been using the wrong terms.
Please note that I do not want to choose between using Part as
covarate OR e.g. Province. I want to allow for different levels in one
covariate, e.g. West split into Provinces and the remaining parts not.
Also: I am using logistig regression (glm).
Thank you for your help.
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