text: Any value of "Y" can therefore be defined as the sum of "Y" and the difference between "Y" and "Y": formula_4 The varian of "Y" is equal to the sum of the variance of the two components of "Y": formula_5 Since the coefficient of determination implies that "sy.x2" = "sy2"(1 − "r2") we can derive the identity formula_6 The square of "r" is conventionally