> [!NOTE] Theorem > Let $X, Y$ be [[Square-Integrable Discrete Real-Valued Random Variable|square-integrable discrete real-valued random variables]]. Then for all $a,b,c,d\in \mathbb{R},$ their [[Correlation Coefficient of Square-Integrable Discrete Real-Valued Random Variables|correlation coefficient]] satisfies $\rho(X,Y)=\rho(Y,X).$ >