Simpson's Paradox
A treatment does better for men, and better for women, and worse for people. None of the arithmetic is wrong.
1903 (Yule), 1951 (Simpson), 1972 (named)20 min read
British statistics and cryptanalysis
Edward H. Simpson
1922 – 2019
British statistician and civil servant. He worked at Bletchley Park during the Second World War and spent most of his career in the Home Civil Service. His single, brief 1951 paper on contingency tables gave its name to the reversal effect, although he was careful to credit the underlying observation to earlier writers and never claimed to have discovered it.