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Factor deletion criteria
3 messages · Iuri Gavronski, David Winsemius, Greg Snow
On May 3, 2013, at 3:32 PM, Iuri Gavronski wrote:
Hi, 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: ?levels ?factor
David Winsemius Alameda, CA, USA
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