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 BIOL2007- NOTES ON POPULATION GENETICS TUTORIAL - Single locus selection and drift

NOTE ON QUESTION 2a:  Yates' Correction

Yates' correction supposedly "corrects for continuity", in other words, it is supposed to make the calculated statistic chi-squareconform more closely to an actual chi-square distribution, which is a continuous distribution.  However, the correction is very small when you have lots of data, as here, where the largest proportional correction is less than 1% (i.e. 74 goes to 74.5).  Given that Yates' correction is overly conservative anyway, many people just don't use it any more.  See: p.736 in Sokal, RR; Rohlf, FJ (1981): Biometry. 2nd ed. Freeman, San Francisco.
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