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...t like a sharman can read a chicken's entrails, with a similar recourse to scientific principles. Interpreting Q-Q plots is more a visceral than an intellectual exercise. The uninitiated are often mystified by the process. Experience is the key here." http://www.maths.murdoch.edu.au/units/statsnotes/samplestats/qqplot.html Having said that I would suggest many people have difficulty understanding density plots, but think that they can understand histograms. I am currently undergoing shaman training ;-) and find that my interpretation of the plots owes more to experience than it does to a s...

Hi all, I am trying to test wheater the distribution of my samples is normal with QQ plot. I have a values of water content in clays in around few hundred samples. Is the code : qqnorm(w) #w being water content qqline(w) sufficient? How do I know when I get the plots which distribution is normal and which is not? Thanks, m [[alternative HTML version