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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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We offer eight fusion strategies and eight distance measures, for hierarchical, polythetic, agglomerative cluster analysis. Results are given for each step in the analysis, along with a publication-quality final dendrogram. Cluster Analysis graph example
Comprehensive Includes major analysis tools plus unique tools for community analyses
SumF
A simple but surprisingly effective method of comparing two or more groups of sample units is to calculate a univariate F statistic for each variable, sum those F statistics, then compare the resulting sum to the distribution of F statistics based on randomizing the data under the null hypothesis. This is the core of the SumF method, as suggested by Edginton (1995). Good performance of this method, as compared to distance-based methods, was found by Warton and Hudson (2004). An advantage to this method is that by aggregating a simple, well-known test statistic, the F ratio, into a summary statistic across multiple variables, we simultaneously obtain information about differences between groups both across all variables and for individual variables. Thus for the generic question, "Do communities differ between groups?", the SumF method allows us to report an answer for communities as a whole as well as for individual species.
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