

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.

Thank you again.

Emiliano.

Date: Fri, 22 Jan 2010 21:32:26 -0800
From: ml-node+1213199-1966337867@n4.nabble.com
To: eeramalho@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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