Karl Pearson, Developer of Pearson Correlation, Negative Correlation, -1, Positive Correlation, 1, kind of categorical data with a set order or scale to it, Ordinal, Weak Correlation, 0, Statistical Package for Social Sciences, SPSS, Summation of X, ∑x, Summation of y, ∑ y, x multiply by y, xy, Summation of xy, ∑xy, Pearson product-moment correlation, Pearson-r correlation, Summation of  x 2, ∑x 2, Summation of y 2, ∑y 2, t is a measure of the strength and direction of association, Pearson product-moment correlation, number of pairs, n.

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