Notation

Description	Example	Meaning
E function	\(E(Y)\)	Expected (mean) value
Var function	\(Var(Y)\)	Variance of a random variable
Subscript	\(E_{Y|X=x}(Y)\) \(E_{Y|x}(Y)\) \(E_Y(Y|X = x)\)	Indicate the distribution used to compute the parameters. In this example, the equation represents the mean of \(Y\) given that random variable \(X\) assumes the value of \(x\)