Errata: The expression E[(Y - f(X))]^2 of course, and as later in the derivation, should read E[(Y - f(X))^2] I'll have to advise my typist to do better in

Errata: The expression E[(Y - f(X))]^2 of course, and as later in the derivation, should read E[(Y - f(X))^2] I'll have to advise my typist to do better in the future!!!