| http://www.w3.org/ns/prov#value | - ?? X , Y = Cov ( X , Y ) ?? X ??? ?? Y , where Cov ( X , Y ) = 1 N ??? j = 1 N ( x j - ?? X ) ??? ( y j - ?? Y ) and - 1 ??? ?? X Y ??? 1. ( 3 ) The correlation coefficient is a measure of how well the two data sets move together (positive values) or move apart from one another (negative values).
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