Dear list members,

I have a significant interaction between two continuous variables (it
happens to be a mixed model in lmer, but I imagine the same is applicable to
a glm). The interaction tells me that the relationship between z and y
changes as a function of x, but I want to know whether y has a significant
effect on z at a given value of x. For instance, the interaction might show
that the relationship between body weight and fitness changes with age, but
I want to know if the association between body weight and fitness is
significantly positive at the age of 1. Therefore, I'd like to estimate 95%
CIs or SEs around the association between body weight and fitness at a given
age, but have yet to work out how to do it. Any suggestions would be greatly
appreciated.

Best wishes,
Adam




-- 
Adam Hayward
Post-Doctoral Research Associate
Department of Animal and Plant Sciences
Alfred Denny Building
University of Sheffield
Western Bank
Sheffield S10 2TN
UK

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