[R] bugs or imperfect implementation?

Peter Dalgaard BSA
Fri, 08 Feb 2002 14:51:41 -0000

Chong Gu <chong at stat.purdue.edu> writes:

> 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.

This happens every time an argument follows a "..." argument. This is
by design. The need for this is not too obvious in the case of data(),
but consider c(x=4,r=7) with the "r" matching "recursive"...

>
> 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)

This does look wrong.

--
   O__  ---- Peter Dalgaard             Blegdamsvej 3
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907