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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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
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注意:您仍然可以导入Excel旧版的.wk1文件以及xls和.xlsx文件。
PC-ORD对电子表格中的生态数据进行多变量分析。PC-ORD的重点是非参数工具、图形表示、随机化测试和自举置信区间的社区数据分析。除了用于转换数据和管理文件的实用程序之外,PC-ORD还提供了许多统计数据包中不可用的排序和分类技术:CCA、DCA、指示物种分析、Mantel试验、部分Mantel试验、MRPP、PCoA、perMANOVA、RDA、双向聚类、TWINSPAN、Beals平滑、多样性指数、物种列表、许多排序叠加方法(定量、符号编码、颜色编码、网格、联合图、双情节、连续向量)、各种旋转方法、3D排序、Bray-Curtis排序、城市街区距离测量、物种面积曲线、树数据摘要、发布质量树图、自动驾驶模式的非度量多维范围(NMS或NMDS)。可以分析大型数据集。只要您计算机的内存够,大多数操作接受多32,000行或32,000列和多536,848,900个矩阵元素的矩阵。完整的手册包括上下文敏感的帮助系统。
Gower Distance,忽略0,0
Gower(1971)和Legendre以及Lengendre(1998)提出了一个有趣的但未经测试的Gower相似系数的变体,忽略了0,0数据对。如果这些双零点被认为是不明确的信息,那么可以从系数的计算中排除它们。双零点的敏感性在社区生态学的分析中产生了不必要的影响
(Legendre & Legendre 1989, p. 253; McCune & Grace 2002, p. 38, 51)。
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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.
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Thank you for the wonderful news that v. 7 has now been released. Even though practically every multivariate statistical technique/method could alternatively be done using R language, I still prefer using PC-ORD for teaching ecology students multivariate statistics. PC-ORD is very user-friendly and offers, in one self-contained package, many powerful methods and a great toolbox (“Modify Data”) that ecology students really need and can quickly utilize in their research. An excellent feature is the textbook-like, built-in documentation explaining theoretical background in detail.
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