[R] re flecting a line

[Gabor Grothendieck]

Try this:

   lines(fitted(lm(x ~ y)), y, lty = 2)


On Wed, Sep 10, 2008 at 4:06 PM, David Epstein
<David.Epstein at warwick.ac.uk> wrote:
>
> Suppose x and y are numeric vectors of the same length.
>
> plot(x,y) #scatterplot
> lmObj1 <- lm(y~x) # best fit line
> abline(lmObj1) # good
> lmObj2 <- lm(x~y) #get best fit but with axes interchanged
> abline(lmObj2) # not what I want. I want the correct line, drawn on the same
> graph, but with
>                    # response and predictor variables interchanged
>
> One way to proceed would be to extract the intercept and slope from lmObj2
> and then do the arithmetic to draw the correct line. I'm hoping for a more
> streamlined method. Is there one?
>
> Thanks
> David
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