Re: [R-sig-eco] interpretation of interaction between explanatory variables

2013-05-10 Thread Bob O'Hara
It's difficult to give definitive advice about what it means, but the simplest approach is to look at what it means: plot the model and see what it looks like. Basically, the interaction says that as the variables both increase, the relationship gets less negative. The details depend on the

[R-sig-eco] interpretation of interaction between explanatory variables

2013-05-08 Thread Iris Kröger
Dear list members, I want to analyse the impact of a competitor community (i.e. community abundances on the one hand and community species diversity on the other hand) on mosquito larval populations of species A and B. Each variable on its own has a negative impact on mosquitoes - but when