eeramalho wrote:
Thank you David. I got it now.
Maybe you can help again.
I am typing the following code to draw a QQ plot but the line does not look
right?
*******************
qqnorm(cbiomass)
qqline(cbiomass)
***********************
the graph looks very different from the graph generated by SAS.
There are two possibilities:
1. you need to use the argument 'datax = TRUE'
2. SAS is wrong
You might also have a look at the qq.plot() function
in package 'car'.
-Peter Ehlers
Thank you again.
Emiliano.
Date: Fri, 22 Jan 2010 21:32:26 -0800
From: ml-node+1213199-1966337...@n4.nabble.com
To: eerama...@hotmail.com
Subject: Re: Quartiles and Inter-Quartile Range
It's looks like you think that type=2 are the 'true' quantiles, but the default
method in R is type=7
You might want to look at ?stats::quantile
hth
david freedman
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