Great! Thank you, Brian.
To answer your question about intercept and slopes, I got them from a
covariance analysis that I had already conducted. It seems like I can not
use the regressions command for the model that I used to get the intercepts
and slopes. I guess 2 factors are the maximum.
+ ddply(test, c("country","treatment"),
+ function(x) {
+ coef(lm(total~ treatment+ year+ country + treatment:year,
x))
+ })
Error in `contrasts<-`(`*tmp*`, value = "contr.treatment") :
contrasts can be applied only to factors with 2 or more levels
Any way to get around this? How about getting back to the abline command?
Thank you.
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