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Correlation ratio
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==Range== The correlation ratio <math>\eta</math> takes values between 0 and 1. The limit <math>\eta=0</math> represents the special case of no dispersion among the means of the different categories, while <math>\eta=1</math> refers to no dispersion within the respective categories. <math>\eta</math> is undefined when all data points of the complete population take the same value.
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