2个离散型随机变量独立性的判定

The determiration on the independence of two discrete random variables

研究了2个取有限值的离散型随机变量X和Y的独立性的判定及数字特征的计算问题,给出了用联合分布律矩阵表示的几个结论及公式,所得结果不仅理论上十分简洁,而且为直接使用Matlab的命令对X和Y的独立性的判定及其数字特征的计算提供了便利.

Discussed the determiration on independence and calculation of numerical characteristics about discrete random variables X andY taking finite value.Several conclusions and formula about the joint distribution law matrix were given.The result is not only very simple in theory,but also provide the necessary formula for the direct use of the order of Matlab to judge the independence and calculate the digital features of X andY.