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单词 stochastic variable
释义

stochastic variable

英汉-汉英词典
随机变量
词组 | 习惯用语
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    discrete stochastic variable 离散随机变量
    load stochastic variable 负荷随机变量
    disperse stochastic variable 离散型随机变量
    normal stochastic variable 正态分布
    continuous stochastic variable 连续型随机变量
    stochastic variable model 随机变量模型
stochastic variable [数] 随机变量
dependent stochastic variable 相依随机变量
中文百科

随机变量 Random variable

(重定向自Stochastic variable)
实数坐标轴上的随机变量示意图
 If the sample space is the set of possible numbers rolled on two dice, and the random variable of interest is the sum S of the numbers on the two dice, then S is a discrete random variable whose distribution is described by the probability mass function plotted as the height of picture columns here.

给定样本空间(S , \mathbb{F}),如果其上的实值函数 X:S \to \mathbb{R}\mathbb{F} (实值)可测函数,则称X为(实值)随机变量。初等概率论中通常不涉及到可测性的概念,而直接把任何X:S \to \mathbb{R}的函数称为随机变量。

如果X指定给概率空间S中每一个事件e有一个实数X(e),同时针对每一个实数r都有一个事件集合A_r与其相对应,其中A_r= { e : X(e)r},那幺X被称作随机变量。随机变量一般用大写拉丁字母或小写希腊字母(比如X, Y, Z, \xi, \eta)来表示,从上面的定义注意到,随机变量实质上是函数,不能把它的定义与变量的定义相混淆,另外概率函数P并没有在考虑之中。

例如,随机掷两个骰子,整个事件空间可以由36个元素组成:

这里可以构成多个随机变量,比如随机变量X(获得的两个骰子的点数和)或者随机变量Y(获得的两个骰子的点数差),随机变量X可以有11个整数值,而随机变量Y只有6个。

英语百科

Random variable 随机变量

(重定向自Stochastic variable)
 If the sample space is the set of possible numbers rolled on two dice, and the random variable of interest is the sum S of the numbers on the two dice, then S is a discrete random variable whose distribution is described by the probability mass function plotted as the height of picture columns here.

In probability and statistics, a random variable, random quantity, aleatory variable or stochastic variable is a variable whose value is subject to variations due to chance (i.e. randomness, in a mathematical sense). A random variable can take on a set of possible different values (similarly to other mathematical variables), each with an associated probability, in contrast to other mathematical variables.

近义、反义、联想词
近义词
n.
variable, variable quantity

英英词典
stochastic variable n.
  1. a variable quantity that is random

  2. synonymous: random variable, variate, variant, chance variable
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