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baselline
2010 Jul 21
1
lm: order of dropped columns
Hi all,
If presented with a singular design matrix, lm drops columns to make the
design matrix non-singular. What algorithm is used to select which (and how
many) column(s) to drop? Particularly, given a factor, how does lm choose
levels of the factor to discard?
Thanks for the help.
Best,
Anirban
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