[R] QQ plot for normality testing

[Keith Jewell]

I have found this web page useful

http://www.cms.murdoch.edu.au/areas/maths/statsnotes/samplestats/qqplot.html

Your mileage may vary.

Keith J

"Matevz Pavlic" <matevz.pavlic at gi-zrmk.si> wrote in message 
news:AD5CA6183570B54F92AA45CE2619F9B90120801E at gi-zrmk.si...
> Hi all,
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> I am trying to test wheater the distribution of my samples is normal with 
> QQ plot.
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> I have a values of water content in clays in around few hundred samples. 
> Is the code :
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> qqnorm(w)      #w being water content
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> qqline(w)
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> sufficient?
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> How do I know when I get the plots which distribution is normal and which 
> is not?
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> Thanks, m
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