Re: [R] Simple qqplot question

From: Ralf B <ralf.bierig_at_gmail.com>
Date: Thu, 24 Jun 2010 18:55:58 -0400

More details...

I have two distributions which are very similar. I have plotted density plots already from the two distributions. In addition, I created a qqplot that show an almost straight line. What I want is a line that represents the ideal case in which the two distributions match perfectly. I would use this line to see how much the errors divert at different stages of the plot.

Ralf

On Thu, Jun 24, 2010 at 5:56 PM, stephen sefick <ssefick_at_gmail.com> wrote:
> You are going to have to define the question a little better.  Also,
> please provide a reproducible example.
>
> On Thu, Jun 24, 2010 at 4:44 PM, Ralf B <ralf.bierig_at_gmail.com> wrote:
>> 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
>>
>> ______________________________________________
>> R-help_at_r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
> Stephen Sefick
> ____________________________________
> | Auburn University                                   |
> | Department of Biological Sciences           |
> | 331 Funchess Hall                                  |
> | Auburn, Alabama                                   |
> | 36849                                                    |
> |___________________________________|
> | sas0025_at_auburn.edu                             |
> | http://www.auburn.edu/~sas0025             |
> |___________________________________|
>
> Let's not spend our time and resources thinking about things that are
> so little or so large that all they really do for us is puff us up and
> make us feel like gods.  We are mammals, and have not exhausted the
> annoying little problems of being mammals.
>
>                                                                -K. Mullis
>



R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 24 Jun 2010 - 22:57:55 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 24 Jun 2010 - 23:40:35 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive