I created a data frame with three factors, plus the response that looks like this:
x1 x2 x3 y a 1 1 0.3 a 2 1 0.1 b 1 1 0.4 c 4 3 0.1 ...
I would like to analise the effect of two of them, keeping the third fixed (I already know the effect of the last). The reason why I don't create several data frames for each value of the thirs factor is simply convenience (I'd like to be able to decide which factor I want to rule out)
boxplot(y ~ x1 + x2, data = mydata[mydata$x3==1,])
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