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
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