What is Yates' correction of contingency?

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Tyto alba
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I can't understand a word of Wikipedia.[/PLAIN]

P.S. What I know so far is subtracting 0.5 from O-E if df=1 in Goodness of fit (?) is Yates' correction.
 
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Yates correction is simply what it says it is, which is you take the absolute difference between the observed and expected value and subtract 0.5. It isn't very popular with many people preferring merging cells that have less than 5 into one bucket.
 
I couldn't edit my question so I posted a new one. Please take a look.
 

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