Yates' correction

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A continuity correction applied to a chi-squared contingency table test. Normally only applied for a 2×2 table, where the effect is greatest and by a happy coincidence the arithmetic required is the simplest. It involves diminishing the numerical size of the difference between observed and expected values by 0.5 before squaring, i.e. the chi-square statistic calculated is

Subjects: Probability and Statistics.

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