Discrete variable 离散变量

阅读量:

变量按其数值表现是否连续,分为 连续变量离散变量。离散变量指变量值可以按一定顺序一一列举,通常以整数位取值的变量。如职工人数、工厂数、机器台数等。有些性质上属于连续变量的现象也按整数取值,即可以把它们当做离散变量来看待。例如年龄、评定成绩等虽属连续变量,但一般按整数计算,按离散变量来处理。离散变量的数值用计数的方法取得。

A discrete variable over a particular range of real values is one for which, for any value in the range that the variable is permitted to take on, there is a positive minimum distance to the nearest other permissible value. The number of permitted values is either finite or countably infinite. Common examples are variables that must be integers, non-negative integers, positive integers, or only the integers 0 and 1.

取值可一一列举,且总数是确定的,如投骰子出现的点数(1 点、2 点、3 点、4 点、5 点、6 点)。

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