William Dunlap wrote:
but I'm not sure why they are being converted to factors in
the first place.
I think expand.grid converts input strings to factors so they
retain the order they have in the input.
Yep. These things do matter. Incidentally, I recently got burned by
cooking an example using expand.grid, writing the data to a file with
write.table and reading it back in during lecture with read.table. Odds
ratio turned upside down...
--
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c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
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