由于混合正态分布模型是非正则的，它的参数估计及其检验都存在很多困难。
Since mixture normal distribution is the non-mixed , the estimation and test have many difficulties .
分析了离散时间线性系统模型参数估计误差的收敛性和收敛速度，对参数估计误差服从渐近正态分布的一些条件进行了讨论。
The convergent property and convergent rate of parameter estimation error are analyzed . Some sufficient conditions are given to guarantee the asymptotic normality of parameter estimation error.
通过实地调研，应用游程检验和P-P概率图的原理，研究了昆明市某超市销售收入，得出在该超市购物的消费额是服从对数正态分布，并对其均值进行了参数估计。
With the aid of on-the-spot investigation, the principle of runs test and P-P plot are applied to the study of sales income of a supermarket in Kunming.
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