[R] Simple qqplot question

Greg Snow Greg.Snow at imail.org
Thu Jun 24 23:59:28 CEST 2010

The line for the perfect match would be abline(0,1) if you want to allow affine transformations, then it gets a bit harder.

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Ralf B
> Sent: Thursday, June 24, 2010 3:45 PM
> To: r-help at r-project.org
> Subject: [R] Simple qqplot question
> I am a beginner in R, so please don't step on me if this is too
> simple. I have two data sets datax and datay for which I created a
> qqplot
> qqplot(datax,datay)
> but now I want a line that indicates the perfect match so that I can
> see how much the plot diverts from the ideal. This ideal however is
> not normal, so I think qqnorm and qqline cannot be applied.
> Perhaps you can help?
> Ralf
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