[R] qqplot

[carol white]

if I have the two following matrices, abline(0,1) doesn't go through. QQplot is attached.

            [,1]     [,2]     [,3]     [,4]     [,5]
 2.149644 1.992864 3.346375 2.793511 3.428230
 1.100762 2.152981 2.735401 2.175185 3.323058
1.212406 2.131813 2.672598 2.389996 3.242490
1.183770 1.908633 2.661237 2.590545 2.906059
 1.665190 1.778923 2.636062 2.475619 4.013407

       
    0.601   0.083   0.520    0.920  -0.007
   -0.778   0.427  -0.605   -0.066  -0.283
  -0.599   0.348  -0.693    0.284  -0.436
   -0.519   0.081  -0.590    0.678  -1.095
    0.009  -0.253  -0.940    0.526   1.623


--- On Mon, 11/2/09, David Winsemius <dwinsemius at comcast.net> wrote:

> From: David Winsemius <dwinsemius at comcast.net>
> Subject: Re: [R] qqplot
> To: "carol white" <wht_crl at yahoo.com>
> Cc: r-help at stat.math.ethz.ch
> Date: Monday, November 2, 2009, 8:17 AM
> 
> On Nov 2, 2009, at 10:40 AM, carol white wrote:
> 
> > Hi,
> > We could use qqplot to see how two distributions are
> different from each other. To show better how they are
> different (departs from the straight line), how is it
> possible to plot the straight line that goes through them? I
> am looking for some thing like qqline for qqnorm. I thought
> of abline but how to determine the slope and intercept?
> 
> I always assumed that the intercept was zero and the slope
> = unity.
> 
>  y <- rt(200, df = 5)
>  qqnorm(y); qqline(y, col = 2)
>  qqplot(y, rt(300, df = 5))
>  abline(0, 1, col="red")
> 
> I am open to education if that assumption is too
> simplistic, but you have not offered anything in the way of
> a counter-example.
> 
> > 
> ==
> 
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
> 
>


      
-------------- next part --------------
A non-text attachment was scrubbed...
Name: qqplot.png
Type: image/png
Size: 6174 bytes
Desc: not available
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20091102/5002dcdf/attachment-0002.png>