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Given a well-behaved real function Y of a real random variable X and the first two or three moments of X , expressions are derived for the moments of Y as linear combinations of powers of the point estimates y(x + ) and y(x - ) , where x + and x - are specific values of X . Higher-order approximations and approximations for discontinuous Y using more point estimates are also given. Second-moment approximations are generalized to the case when Y is a function of several variables.
Emilio Rosenbluéth (Wed,) studied this question.