The association coefficient was taken for the similar degree of amphibians in every two zoogeographical zones.The cluster analysis was taken by group average method. 建立物種有無分佈的二元數據列聯表，利用聯合係數表示每兩個地理小區內兩棲動物的相似程度，以類平均法進行了聚類分析。
A Small signal model set up through the aid of state space average method can do a world of good for Conducting high frequency Switching Power supply stable analysis. 推證出用狀態空間平均法建立小信號模型對高頻開關電源進行穩定性分析的方法。
