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Sheppard's correction

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noun Statistics.
  1. a method of correcting the bias in standard deviations and higher moments of distributions that arises from grouping values of the variable.

Origin of Sheppard's correction

named after William F. Sheppard (1863–1936), English statistician
Also called Sheppard's adjustment.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018