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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PC-ORD Features not Found in R
TWINSPAN
TWINSPAN simultaneously classifies species and samples. At its core, TWINSPAN is based on dividing a reciprocal averaging ordination space. One of the most useful features of TWINSPAN is the final ordered two-way table. Species names are arrayed along the left side of the table, while sample numbers are along the top. The pattern of zeros and ones on the right and bottom sides define the dendrogram of the classifications of species and samples, respectively. The interior of the table contains the abundance class of each species in each sample. Abundance classes are defined by pseudospecies cut levels.
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。
*四角问题
因为是四个基本矩阵的排列(参见Dray和Legendre(2008,Fig.1a)和McCune 和Grace(2002,Fig.2.1)的形状x环境位置),所以通过样本单元X物种矩阵将物种性状与环境变量联系起来的方法问题被称为*四角问题。*四角分析提供了这些矩阵之间的链路强度的统计测试。*四角分析理论与数学的详细解释请参看Legendre et al. (1997), Dray和Legendre (2008), Ter Braak et al, (2012), 和 Dray et al. (2014)。
二元分类
如果已给变量中,有n个分类(每个分类级别有特的值标签),然后将生成n个新的二进制(0/1)变量。每个新变量将被值为0或1的Q变量。
Multivariate Analysis of Ecological Data For Windows 98, 00, ME, NT, XP, Vista, 7, 8, and 10
PC-ORD performs multivariate analysis of ecological data entered in spreadsheets. Our emphasis is on nonparametric tools, graphical representation, randomization tests, and bootstrapped confidence intervals for analysis of community data. In addition to utilities for transforming data and managing files, PC-ORD offers many ordination and classification techniques not available in major statistical packages including: CCA, DCA, Indicator Species Analysis, Mantel tests and partial Mantel tests, MRPP, PCoA, perMANOVA, RDA, two-way clustering, TWINSPAN, Beals smoothing, diversity indices, species lists, many ordination overlay methods (quantitative, symbol-coding, color-coding, grid, joint plot, biplot, successional vector), various rotation methods, 3-D ordination graphics, Bray-Curtis ordination, city-block distance measures, species-area curves, tree data summaries, publication-quality dendrograms, and autopilot mode nonmetric multidimensional scaling (NMS or NMDS). Very large data sets can be analyzed. Most operations accept a matrix up to 32,000 rows or 32,000 columns and up to 536,848,900 matrix elements, provided that you have adequate memory in your computer. The terminology is tailored for ecologists. The full manual is included as a context-sensitive help system.
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