search for: platykurt

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2000 Sep 21
2
qqnorm(), is it "backwards"?
...ey should all be reflected in the normal qqline(). For instance: if I qqnorm() bimodal or uniform data I get a sigmoidal in which the qqnorm() points lie above the qqline() at -ve theoretical quantiles, and the qqnorm() points lie below the qqline() at +ve theoretical quantiles. Yet I expect such platykurtic distributions to go the other way (eg pg 117 in _Biometry_ Sokal & Rohlf, 3rd ed). The same thing with skewed data, I expect right skewed data to show a negatively accelerating shape, but qqnorm() curves upwards. Am I missing something, or is qqnorm() consistently heading in the wrong diir...