Re: [R] abline in log-log power law plot

From: hadley wickham <h.wickham_at_gmail.com>
Date: Fri, 22 Feb 2008 16:21:50 -0600

On Fri, Feb 22, 2008 at 2:38 PM, martin klein <mklein_at_cs.odu.edu> wrote:

>

> I have a power law plot in log-log scale using plot(x,y,log="xy") but I
> can't get the regression line to plot correctly.
> abline(lm(log(y)~log(x))) plots a straight line that looks promising but
> the intercept with the y-axis seems to be way off.
> summary(lm(log(y)~log(x))) gives the values but i cant really make any
> sense out of it.
> fitted(..) just confirms the values that seem to be incorrect.
> any help is appreciated.
> thanks!

You might try using ggplot2 instead:

install.packages("ggplot2")
library(ggplot2)

qplot(x, y, log="xy") + geom_smooth(method = lm)

Hadley

-- 
http://had.co.nz/

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Received on Fri 22 Feb 2008 - 22:24:49 GMT

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