Quartiles and Inter-Quartile Range
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+1213199-1966337867 at n4.nabble.com To: eeramalho at 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 View message @ http://n4.nabble.com/Quartiles-and-Inter-Quartile-Range-tp1145817p1213199.html To unsubscribe from Quartiles and Inter-Quartile Range, click here.
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Peter Ehlers University of Calgary