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\[\rho = r_s = 1 - \frac{6\sum{d^2_i}}{n(n^2-1)}\]
Note: if there are tied ranks, the following method can be used to calculate the Spearman Correlation:
\[\rho = \frac{\sum_i (x_i - \bar{x})(y_i - \bar{y})}{\sqrt {\sum_i (x_i - \bar{x})^2 \sum_i (y_i - \bar{y})^2}}\]
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