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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.
Group Linkage Methods
Nearest Neighbor
Farthest Neighbor
Median
Group Average
Centroid
Ward's Method
Flexible Beta
McQuitty's Method
Ward's is also know as Orloci's and Minimum Variance Method
PC-ORD: What’s New
Hilltop Plot
A hilltop plot is a way of showing more than one nonlinear response surface at a time.
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Bray-Curtis (Polar)
We offer numerous options and improvements beyond Bray and Curtis' original method, such as perpendicularized axes and variance-regression endpoint selection.
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