Message-ID: <5c79da7a1001280845j7433c2bem9f09009724f51803@mail.gmail.com>
Date: 2010-01-28T16:45:08Z
From: Marcin Kozak
Subject: Setting base level for contrasts with lme
Hi all,
Note:
lm(Yield ~ Block + C(Variety, base = 2), Alfalfa)
equals
i <- 2; lm(Yield ~ Block + C(Variety, base = i), Alfalfa)
However,
lme(Yield ~ C(Variety, base = 2), Alfalfa, random=~1|Block)
which is fine, does not equal
i <- 2; lme(Yield ~ C(Variety, base = i), Alfalfa, random=~1|Block)
after which I get the message
"Error in model.frame.default(formula = ~Yield + Variety + i + Block,
data = list( : variable lengths differ (found for 'i')"
Is everything fine with that?
Regards,
Marcin