[R] Factor deletion criteria
dwinsemius at comcast.net
Sat May 4 05:47:30 CEST 2013
On May 3, 2013, at 3:32 PM, Iuri Gavronski wrote:
> I would like to know the criteria by which R removes a factor in linear
> models. For example, I have a four level factor, and R creates 3 dummies to
> estimate coefficients. Which level is chosen? Can I chance it?
The default order is alphabetical. Lowest lexical sorted item is the reference level.
Changing levels is possible:
Alameda, CA, USA
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