6. Allow heterogeneous dispersions in PERMANOVA
6.1 Overview - Allow heterogeneity
An important assumption of classical analysis of variance (ANOVA) is that the errors come from a ...
6.2 ANOVA in a nutshell
The one-way ANOVA model In one-way univariate analysis of variance (ANOVA), interest lies in comp...
6.3 The Behrens-Fisher problem (BFP)
Overview The Behrens-Fisher problem (BFP) is one of the oldest puzzles in statistics (; ; ). The ...
6.4 Multivariate Behrens-Fisher problem
Overview In a multivariate context, there are many ways that groups of sampling units can differ ...
6.5 Solution to the multivariate BFP
Overview described a general dissimilarity-based solution to the multivariate Behrens-Fisher pro...
6.6 Example: one-way PERMANOVA allowing heterogeneity
Let's look now at an example where there is a single factor in the study design, the number of re...
6.7 Heterogeneity in more complex designs
Handling heterogeneity with multiple factors The most important question to answer when you are d...
6.8 Example: two-way crossed PERMANOVA allowing heterogeneity
We shall look at the diets of $N$ = 346 juvenile steelhead / rainbow trout (Oncorhynchus mykiss) ...