目的介绍并应用广义负二项分布研究湖北钉螺的分布规律，为定量化研究提供理论依据。
Objective To study the distribution of Oncomelania hupensis with generalized negative binomial distribution, and provide the theoretical support for quantitative study.
利用条件矩的性质特征刻画伽玛分布，负二项分布，广义混合指数分布，广义混合几何分布。
By using conditional moments, the author characterized the Gamma, Negative Binomial, Generalized Mixed Exponential and Geometric distributions respectively.
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