主要使用了有序样品聚类分析中的离差平方和法、最优分割法，再结合地震学应变能释放水平进行划分。
We use mainly the squariance method among sequence samples cluster analysis and the method of optimum partition, and combine the standard of release level of seismology strain energy to divide it.
以双因素协方差分析为例，介绍如何用代数中投影的方法进行离差平方和分解。
Take the two-factor covariance analysis for example, the projection method is used to decompose the derivate square.
本文从各种距离之间的关系来对重心法、类平均法及离差平方和法作一些分析比较。
By making an analysis of different relations of distance, method of gravity center, method of mean value of class and method of sum of squares of deviations are compared in this paper.
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