The simplest solution to your problem is to use
probability paper. If you do not have easy access to
this, you can download a free graph paper plotter from
There are also simple algorithms to produce your own.
Two populations show up on a probability plot as a
line with a definite 'kink' in it. Skewed
distributions should be plotted on a logarithmic
Explanations can be found in my paper ROKE paper (C&G
1977) which is computer oriented or in my IMGC paper
(1993). Both downloadable from
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