使用期限*
许可形式单机版
原产地美国
介质下载
适用平台Windows
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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.
Although some similar tools are available in PC-ORD and R, the user experience differs radically. PC-ORD is a Windows software program with a graphical user interface that does not require coding. PC-ORD offers ease of use, expert-driven analysis preference options, the power and flexibility of interactive graphics, a built-in help system, and free dedicated technical support. PC-ORD also allows advanced users to develop scripts through its "Batch" facility (introduced in v.6), as well as the ability to incorporate user-developed modules into the menu system.
NMS Scores
NMS Scores provides a prediction algorithm for non-metric multidimensional scaling (NMS). This is not prediction in the sense of forecasting, but rather statistical prediction in the same way as using multiple regression to estimate a dependent variable. NMS Scores calculates scores for new items based on prior ordinations.
- Hilltop Plot
A hilltop plot is a way of showing more than one nonlinear response surface at a time.
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ContourOverlay.jpg (404740 bytes) - Contour Overlay
Overlay a quantitative (Q) variable as a contoured surface on any ordination.
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ConvexHullsFilledPolygons.jpg (164154 bytes) - Convex Hulls Filled Polygons
A convex hull is an overlay that uses a polygon to enclose all of the points in a group.
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