条件期望 Conditional expectation
（重定向自Conditional expected value）
在概率论中，条件期望是一个实数随机变量的相对于一个条件概率分布的期望值。换句话说，这是给定的一个或多个其他变量的值一个变量的期望值。它也被称为条件期望值或条件均值。
条件期望的概念在柯尔莫哥洛夫的测度理论概率论的定义很重要。条件概率的概念是由条件期望来定义。
Conditional expected value
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Conditional expectation 条件期望
（重定向自Conditional expected value）
In probability theory, the conditional expectation of a random variable is another random variable equal to the average of the former over each possible "condition". In the case when the random variable is defined over a discrete probability space, the "conditions" are a partition of this probability space. This definition is then generalized to any probability space using measure theory.
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