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minidp
2009 Oct 01
2
Re gression for levels of a factor/xyplot type="r"
Hi,
I'm sure these are basic problems so I apologise in advance for my
ignorance. I have a dataset with X, Y, and a Factor with 4 levels. I am
trying to figure out how to use lm() to find the r2 value, slope and
intercept of an X~Y regression, for each level of the Factor. Is there a
way to do this automatically without having to specify different subsets of
the factor?
my code so far: