[R] bugs or imperfect implementation?
Chong Gu
chong at stat.purdue.edu
Fri Feb 8 15:26:20 CET 2002
I am using R to teach, and here are a couple of things that I thought
would work didn't work.
1. I noticed the utility data(***,package=***) recently and like it
very much, but unless I type in the whole word "package" I'll get an
error in 1.4.0. For example, data(cats,package=MASS) works fine but
data(cats,pac=MASS) doesn't.
2. drop1 doesn't seem to be as smart as before. In the sequence
below, drop1 didn't produce what I expected it to produce.
data(HairEyeColor); lab<-dimnames(HairEyeColor)
HairEye<-cbind(expand.grid(Hair=lab$Hair,Eye=lab$Eye,
Sex=lab$Sex),Fr=as.vector(HairEyeColor))
HairEye.fit<-glm(Fr~.^2,poisson,HairEye)
drop1(HairEye.fit)
The following sequence however works.
HairEye.fit<-glm(Fr~(Hair+Eye+Sex)^2,poisson,HairEye)
drop1(HairEye.fit)
Chong Gu
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