The distribution parameters have been estimated with either the maximum likelihood method or a modified moment method. 对其中的参数分别用极大似然法和改进的矩法进行了估计。
The parameters of the model are fuzzily processed and the fuzzy risk can be evaluated by using the modified first order second moment method. 通过对模型中的参数进行模糊化处理，用改进一次二阶矩法计算了地下水过量开采的模糊风险率。
