hadley wickham wrote:
> On Fri, Feb 22, 2008 at 2:38 PM, martin klein <[EMAIL PROTECTED]> 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
>
>
Or just switch to base-10 logarithms:
abline(lm(log10(y)~log10(x)))
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