Classical feature extraction methods include: Principle Component Analysis, Singular Value Decomposition, Projection Pursuit, Self-Organizing Map, and so on.
传统的特征提取方法主要有：主分量分析、奇异值分解、投影追踪、自组织映射等。
These methods include the Principle component analysis, the Regression analysis, the Grey cognate analysis, the Delphi, the Ordering method, the Analytical Hierarchy Process, Fuzzy method.
目前学术界对土地等级评价所使用的主要方法有：主成分分析法、回归分析法、灰色关联度分析法、特尔斐法、排序法、层次分析法、模糊综合评价法。
The working principle, characteristics and electric parameter selection of the restraint EMI circuit are studied in this paper. The computing methods of electric component parameters are given.
对所设计的抑制电磁干扰电路的工作原理、特点和电气参数选择等进行了研究，给出了相应电气元件参数选择的计算方法。
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