- coplot is a graphical method by which you can show how a response depends on a predictor given other predictors
- cut(var, n) cuts a continuous variable into n intervals, you can also specify your own breakpoints (breaks=c()); the result of cut is a factor
example code:
> attach(iris)
> coplot(Sepal.Length~Petal.Length|Species, col=unclass(Species), panel=panel.smooth)
> coplot(Sepal.Length~Petal.Length | cut(Sepal.Width,4) * cut(Petal.Width,2), col=unclass(Species), panel=panel.smooth)
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