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$\begin{displaymath}�5266�\mathop{\mathrm{corr}}(X,Y)=�5267�\frac{\displaystyle�5268�\sum_{i=1}^n(x_i-\overline x)�5269�(y_i-\overline y)}�5270�{\displaystyle\biggl[�5271�\sum_{i=1}^n(x_i-\overline x)^2�5272�\sum_{i=1}^n(y_i-\overline y)^2�5273�\biggr]^{1/2}}�5274�\end{displaymath}$

\begin{displaymath}
\mathop{\mathrm{corr}}(X,Y)=
\frac{\displaystyle
\sum_{i=1}^n(x_i-\overline x)
(y_i-\overline y)}
{\displaystyle\biggl[
\sum_{i=1}^n(x_i-\overline x)^2
\sum_{i=1}^n(y_i-\overline y)^2
\biggr]^{1/2}}
\end{displaymath}

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