What is the conditional expectation function or the population ... | Filo

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Conditional Expectation: Definition & Step by Step Example -

105 (b) - Properties of Conditional Expectations

SOLVED:Show that conditional expectation is an orthogonal projection in the sense that it satisfies the Pythagorean identity ℰ(Y^2)=ℰ{[ℰ(Y |ℱ)]^2}+ℰ{[Y-ℰ(Y |ℱ)]^2} and the random variables ℰ(Y |ℱ) and [Y-ℰ(Y |ℱ)] are orthogonal, ℰ{ℰ(Y |ℱ)[Y-ℰ(Y |ℱ)]}=0 .