How to get the points of a linear regression line?

Question

I do a simple linear regression mod <- lm(y ~ x) and I plot its residuals, doing plot(mod$residuals). Two questions:

I need to plot the line of the regression in the chart where I plotted the residuals, how can I do it?
I need to know the points of this line, because I should plot this line in another application, so I need those points (as a vector), how can I do?

Thank you!

mpiktas · Accepted Answer · 2011-10-07 12:38:33Z

up vote 3 down vote accepted

You can get the points with

predict(mod)

edited Oct 7 '11 at 12:38

mpiktas
13.9k31860

answered Oct 2 '11 at 13:34

thias
450212

mpiktas · Answer 2 · 2011-10-03 12:50:35Z

up vote 2 down vote

You can use abline. In your case, just add

abline(mod)

edited Oct 3 '11 at 12:50

mpiktas
13.9k31860

answered Oct 2 '11 at 12:35

Peter Flom
22.8k32351

	ok thanks! what about the points of that line ? How can I get them? – Dail Oct 2 '11 at 12:37
	As long as you have mod stored, you don't need the points. But you can get them with coef(mod), I believe – Peter Flom Oct 2 '11 at 12:41
	yes I know but i have to save the data (the list of points) how can i calculate them? is there a function? – Dail Oct 2 '11 at 12:53
	You don't need a list of points. Just the coefficients; that's enough to plot a line. – Peter Flom Oct 2 '11 at 13:20

2 Answers