| 单词 | expected value |
| 释义 | > as lemmasexpected value expected value n. Mathematics a weighted average of all the possible values a random variable can assume, each value being weighted according to the probability of it occurring.In terms of calculation, the expected value of a random variable takes the form of the sum or, if the random variable is continuous, the integral of all values multiplied by their associated probabilities. [Probably after German Erwartungswert (1906 or earlier in this sense; first half of the 19th cent. or earlier in different senses (frequently in actuarial and forestry contexts)), lit. ‘expectation value’. The Russian term is matematičeskoe ožidanie, lit. ‘mathematical expectation’.] ΘΚΠ the world > relative properties > number > probability or statistics > [noun] > variable > expected value of expected value1915 1915 A. Fisher & W. Bonynge Math. Theory of Probabilities i. xix. 97 Russian and Scandinavian writers and the followers of the Lexis statistical school of Germany have preferred to make another quantity known as the ‘probable’ or ‘expected value’. 1958 M. G. Kendall Adv. Theory of Statistics I. 51 The notation E derives from the fact that in probability theory such values are often known as ‘expected values’ or ‘expectations’. 2000 N.Y. Times 16 Jan. iv. 2/5 Expected value is the average result, over the long term, that somebody can expect to see from a given decision. < as lemmas |
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