[R] glm contrasts

Natalie Holt fbsnch at leeds.ac.uk
Fri May 7 11:15:36 CEST 2010


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,


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