Hi all,
I want t use a contrasts in adjusted regression (lm()) for a factor with four
levels, compared the coefficients first with second, first with third, ...,
third with fourth.
Someone can help with a contrast matrix to be used. I tried and not yet I
obtained.
Say:
y <- rnorm(50)
x <- cut(rnorm(50, mean=y, sd=0.25),c(-3,-1.5,0,1.5,3))
reg <- lm(y ~ x, contrasts = list(x="contr.sum"))
Thank you,
Ricardo
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