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第五百一十一章 马尔科夫转移矩阵法(概率与统计)(1 / 2)

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自从发现马尔科夫链之后,马尔可夫便开始进行深度挖掘。

一个系统的某些因素在转移中,第n次结果只受第n-1的结果影响,只与当前所处状态有关,与其他无关。在马尔科夫分析中,引入状态转移这个概念。所谓状态是指客观事物可能出现或存在的状态;状态转移是指客观事物由一种状态转移到另一种状态的概率。

马尔可夫认为自己可以对一个系统进行预测,自己可以当一个完美的算命先生。

就是使用马尔可夫转移矩阵法。

假定某大学有1万学生,每人每月用1支牙膏,并且只使用“中华”牙膏与“黑妹”牙膏两者之一。根据本月(12月)调查,有3000人使用A牙膏,7000人使用B牙膏。又据调查,使用A牙膏的3000人中,有60%的人下月将继续使用A牙膏,40%的人将改用B牙膏;使用B牙膏的7000人中,有70%的人下月将继续使用B牙膏,30%的人将改用A牙膏。

现用\拟用 A牙膏 B牙膏

A牙膏 60% 40%

B牙膏 30% 70%

根据这个表,马尔可夫用矩阵表示。

B=[ 60% 40%]

[ 30% 70%]

称为转移概率矩阵。可以看出,转移概率矩阵的一个特点是其各行元素之和为1。在本例中,其经济意义是:现在使用某种牙膏的人中,将来使用各种品牌牙膏的人数百分比之和为1。

有了转移矩阵,可以预测下一个月(1月)的使用各种牙膏的人数。

(3000 ,7000)[ 60% 40%]=(3900,6100)

[ 30% 70%]

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