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Aug 3, 2010 at 16:44 comment added John D. Cook True. Necessary but not sufficient.
Aug 3, 2010 at 14:59 comment added PeterR And so if the mean is the same as the variance, could you conclude that the data was Poisson? Hardly!
Aug 3, 2010 at 14:39 history answered John D. Cook CC BY-SA 2.5