[R] correlation coefficient from qq plot

Domenico Vistocco vistocco at unicas.it
Thu Dec 6 09:56:15 CET 2007

You could use the qqnorm function to obtain the correlation, as:

 > qqp=qqnorm(rstudent(regrname))
 > cor(qqp$x,qqp$y)

If you do not want see the plot (as the qq.plot is richer):
 > qqp=qqnorm(rstudent(regrname), plot.it=F)

domenico vistocco

Tom Fitzhugh wrote:
> Hi,
> I am trying to figure out how to get the correlation coefficient for a
> QQ plot (residual plot).  So to be more precise, I am creating the plot
> like this:
> qq.plot(rstudent(regrname), main = rformula, col=1) 
> But want to also access (or compute) the correlation coefficient for
> that plot.
> Thanks,  
> Tom
> 	[[alternative HTML version deleted]]
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