Paradoxe de Simpson
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Simpson's Paradox
Put simply, Simpson's Paradox is a phenomenon found in probability in which a trend appears in several different groups, but vanishes or reverses when the groups are combined. The paradox is often found in the social-science and medical-science disciplines and requires casual relations to be appropriately addressed to mitigate inference errors due to the phenomenon. First described by Edward H. Simpson in his 1951 paper, the phenomenon itself had been observed and mentioned in works as early as 1899.
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