[R] The contrast and Design libraries

R. Michael Weylandt michael.weylandt at gmail.com
Fri Nov 25 04:47:51 CET 2011

On another list it was reported that a new version of contrast was
uploaded to CRAN earlier today that makes use of Design's replacement
"rms". Wait a day or two and then download this updated version and



On Thu, Nov 24, 2011 at 12:23 PM, Joanne Lello <LelloJ at cardiff.ac.uk> wrote:
> Dear all,
> I have been using the contrast library in my teaching for the last couple
> of years and am right in the middle of this year's round. In the last week
> R has been updated to version 2.14.0 on our computers. This has had the
> unfortunate effect of meaning the contrasts library no longer works, as
> the Design library is no longer available. I wonder if anyone has a fix
> for this...or alternatively can tell me another package that is as simple
> to use (the students won't cope with anything more complicated - we're all
> biologists not statisticians).
> I hope someone can help.
> Here is a typical bit of code I'm currently running so you can see what
> I'm trying to do:
> exptime is a covariate and both infstat and status are factors
> mod<-glm(propalive~exptime+infstat+status+
>        infstat:status,
>        data=dat)
> library(contrast)
> contrast(mod3,
>   a = list(status = levels(dat$status), infstat="control", exptime=8230),
>   b = list(status = levels(dat$status), infstat="infected",exptime=8230))
> any help gratefully received,
> Jo
> Dr Joanne Lello
> Cardiff University
> School of Biosciences
> Organism and Environment Group
> Biomedical Sciences Building
> Museum Avenue
> Cardiff
> CF10 3AX
> Tel: 02920 875885
> E-mail: lelloj at cardiff.ac.uk
>        [[alternative HTML version deleted]]
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