[R] glm contrasts

Max Kuhn mxkuhn at gmail.com
Fri May 7 15:16:42 CEST 2010

There is the contrast package

On Fri, May 7, 2010 at 5:15 AM, Natalie Holt <fbsnch at leeds.ac.uk> wrote:
> Hi,
> I have some data on the effect of cycle shape (categorical) and frequency
> (continuous) on the efficiency of muscle contraction. My minimum adequate
> model is:
> m15<-glm(efficiency~cycle.shape*freq, family=quasipoisson)
> However, I wish to know where significant differences lie between specific
> combinations of treatments. I guess I want an equivalent of a post hoc test
> following an ANOVA. Is there a way of doing this for 2 explanatory variables
> with an interaction between them and the above error structure.
> Mnay thanks,
> Natalie
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