[R] Regression lines
Tom Backer Johnsen
backer at psych.uib.no
Fri Jan 12 10:39:23 CET 2007
My simpleminded understanding of simple regression is that when
plotting regression lines for x on y and y on x in the same plot, the
lines should cross each other at the respective means. But, given the
R function below, abline (lm(y~x)) works fine, but abline (lm(x~y))
does not. Why?
function () {
attach (attitude)
x <- rating
y <- learning
detach (attitude)
plot (x, y)
abline(v=mean(x))
abline(h=mean(y))
abline (lm(y~x))
abline (lm(x~y))
}
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