本文基于EM算法,对于Ⅱ型混合删失数据,分别在Gamma和正态寿命分布族下进行了参数估计,并且推导了协防差矩阵.最后给出了几个很好的数值例子,对本文的结论进行了诠释。
In this paper,we estimate parameters of gamma life distribution and normal life distribution by EM algorithm based on Type-Ⅱ hybrid censored data.The covariance matrices are derived as well.Some numerical examples are also presented for illustration.