of;
Mathematics;
and;
Computation;
Science,;
Zhanjiang;
Normal;
University,;
Guangdong;
524048.;
P.;
R.;
China;
of;
Mathematics;
and;
Statistics,;
Lanzhou;
University,;
Gansu;
730000,;
P.;
R.;
China;
EM算法; 极大似然估计; 删失数据; 最大似然估计; 区间; 时间间隔; MLE; GE;