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Phi Coefficient

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In statistics, the phi coefficient or r is a measure of association for two binary variables. This measure is similar to the Pearson correlation coefficient in its interpretation. In fact, a Pearson correlation coefficient estimated for two binary variables will return the phi coefficient. The Phi coefficient is also related to the chi-square statistic for a 2×2 contingency table.