令X,Y表二獨立之隨機變數,則(X,Y)及max{X,Y}之分布及特徵函數各有兩種不同表示方式,也因此有二種不同估計方法,本文之主要目的在比較此二種估計法之優劣。 Let X,Y be independent random variables. Distribution and characteristic functions for (X , Y) and max{X , Y} can be expressed by two different reports in each other. We will compare distribution and characteristic functions for (X , Y) and max{X , Y} in different estimation.