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:
Regression<-lm(Y~X, data=dataset, subset=factor(Factor))
Also, when I plot this dataset using:
xyplot(Y~X|factor(Factor), data=dataset, aspect="iso",
type=c("p","g","r"),pch=21,cex=1)
I get a four panel plot (one for each level of the factor) with a regression
line for each. How do I figure out the r2 value and coefficients of each
regression line and add them as text to the plot.
Thanks for your help!
James
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