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@wikipedia


LaTeX Math Block
anchor1
alignmentleft
\rho_s(x,y) = \rho_p(rg(x),rg(y)) = 1 - \frac{6}{n(n^2-1)} \sum_i \big( rg(x_i)-rg(y_i) \big)^2

where 

LaTeX Math Inline
bodyrg(x_i)
 and 
LaTeX Math Inline
bodyrg(x_i)
 are the ranks of elements 
LaTeX Math Inline
bodyx_i
 and
LaTeX Math Inline
bodyy_i
.