I'm trying to update my "perturb" package to get rid of some small warning 
messages. The examples in "perturb" use the "Duncan" dataset from the "car" 
package and I have "car" installed in R. But when I run "R CMD check", I get an 
error message 


> require("car")
Loading required package: car
Warning in library(package, lib.loc = lib.loc, character.only = TRUE, 
logical.return = TRUE,  :
  there is no package called 'car'
> data(Duncan)
Warning in data(Duncan) : data set 'Duncan' not found

This is very strange, the example works fine if I just run it in R. This is the 
example from the perturb.rd file:

  \examples{
require("car")
data(Duncan)
attach(Duncan)
m1<-lm(prestige~income+education)
...

I'm using R 2.11.1 under Ubuntu 10.04. Perhaps the problem is related to the 
packages being installed in my home directory. I've create an ~/.Renviron file 
with 

R_LIBS_USER="/home/john/lib/R/library"

I've also tried creating an environment variable "export 
R_LIBRARY_DIR=/home/john/lib/R/library/" before running R CMD check. That made 
no difference. Can anyone point me in the right direction? Do I have to install 
packages in R_HOME?



      
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