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原产地美国
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适用平台Windows
北京天演融智软件有限公司（科学软件网）前身是北京世纪天演科技有限公司，成立于2001年，专注为国内高校、科研院所和以研发为主的企事业单位提供科研软件和服务的国家。
Principal Coordinates Analysis (PCoA)
Principal Coordinates Analysis is an eigenanalysis technique similar to PCA, except that one extracts eigenvectors from a distance matrix among sample units (rows), rather than from a correlation or covariance matrix. In PCoA one can use any square symmetrical distance matrix, including semi-metrics such as Sorensen distance, as well as metric distance measures such as Euclidean distance.
基于距离的冗余分析（DBRDA）
基于距离的冗余分析（DRBDA）类似于冗余分析（RDA），除了主矩阵由它的主坐标代替，使用您选择的距离度量。这个变体的目的是允许您选择non-Euclidean距离度量，如Sorensen（Bray-Curtis），这个已经在群落生态学中是有效的。
Reciprocal Averaging (RA) = Correspondence Analysis (CA)
Reciprocal averaging is also known as correspondence analysis (CA). It is performed in PC-ORD by selecting options in program DCA adapted from the Cornell Ecology Program series. Reciprocal averaging (RA) yields both normal and transpose ordinations automatically. Like DCA, RA ordinates both species and samples simultaneously.
The objective of my courses is the understanding of the process of multivariate data analysis and not so much on the technical part, even the latter results in a more thorough understanding of the procedures applied. When students understand why and how to effectively do multivariate statistical analyses of their data, they can then use, with little effort, other programs or packages as well.
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