"When the Okies left Oklahoma and moved to California, they raised the average intelligence in both states." - Will Rogers
A new post from Richard Elwes on the "Will Rogers phenomenon," an interesting, yet simple situation that can arise when considering sets and averages (and sometimes a concern for epidemiological studies):
http://richardelwes.co.uk/2012/12/01/the-will-rogers-phenomenon/
(...it all reminds me a tad of "Parrondo's Paradox" from game theory, where once again straightforward mathematics leads to a somewhat unexpected result.)
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