[R] bugs or imperfect implementation?

[Chong Gu]

   Date: Fri, 8 Feb 2002 15:21:27 +0000 (GMT)
   From: Prof Brian D Ripley <ripley at stats.ox.ac.uk>
   Sender: ripley at auk.stats
   cc: r-help at stat.math.ethz.ch
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   On Fri, 8 Feb 2002, Chong Gu wrote:

   >
   > 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)

   It's not a change in drop1, though, where the basis of this (drop.scope) is
   unchanged since 1999.  I suspect a side effect of changes in the
   formula/terms handling.  Do you know when it did work?


   -- 
   Brian D. Ripley,                  ripley at stats.ox.ac.uk
   Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
   University of Oxford,             Tel:  +44 1865 272861 (self)
   1 South Parks Road,                     +44 1865 272860 (secr)
   Oxford OX1 3TG, UK                Fax:  +44 1865 272595


I used the same notes last year this time and it should have worked
then, and the version might be 1.2.0 or 1.2.2, in case they had been
released then.  We upgraded from 1.2.2 to 1.4.0 on our AIX server in
early January this year.

Chong Gu
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