| conditional expectation [kǝn`dish·ǝn·ǝl ´ek´spek`tā·shǝn] MATHEMATICS If X is a random variable on a probability space (Ω,F,P ), the conditional expectation of X with respect to a given sub σ-field F' of F is an F'-measurable random variable whose expected value over any set in F' is equal to the expected value of X over this set. STATISTICS The expected value of a conditional distribution. |