Chapter 6: Testing for differences between groups of samples
6.1 Univariate tests and multivariate tests
Many community data sets possess some a priori defined structure within the set of samples, for e...
6.2 ANOSIM for the one-way layout
Fig.6.3 displays the MDS based only on the 12 samples (4 replicates per site) from the B, C and D...
6.3 Example: Frierfjord macrofauna
The rank similarities underlying Fig. 6.3 are shown in Table 6.2 (note that these are the similar...
6.4 Example: Indonesian reef-corals
examined data from 10 replicate transects across a single coral-reef site in S. Tikus Island, Th...
6.5 ANOSIM for two-way layouts
Three types of field and laboratory designs are considered here: a) the 2-way nested case can ari...
6.6 Example: Clyde nematodes (2-way nested case)
analysed meiobenthic communities from three putatively polluted (P) areas of the Firth of Clyde ...
6.7 Example: Eaglehawk Neck meiofauna (two-way crossed case)
An example of a two-way crossed design is given in and is introduced more fully here in Chapter ...
6.8 Example: Mesocosm experiment (two-way crossed case with no replication)
Although the above test may still function if a few random cells in the 2-way layout have only a ...
6.9 Example: Exe nematodes (no replication and missing data)
A final example demonstrates a positive outcome to such a test, in a common case of a 2-way layou...
6.10 ANOSIM for ordered factors
Generalised ANOSIM statistic for the 1-way case Now return to the simple one-way case of page 6.2...
6.11 Example: Ekofisk oil-field macrofauna
studied the soft-sediment macrobenthos at 39 sites at different distances (100m to 8km) and diff...
6.12 Two-way ordered ANOSIM designs
Under the non-parametric framework adopted in this manual (and in the PRIMER package) three forms...
6.13 Example: Phuket coral-reef time series
These data are discussed more fully in Chapters 15 and 16; sampling of coral assemblages took pla...
6.14 Three-way ANOSIM designs
Table 6.4 details all viable combinations of 3 factors, A, B, C, in crossed/nested form, ordered/...
6.15 Example: King Wrasse fish diets, WA
We begin the 3-factor examples with a fully crossed design A$\times$B$\times$C of the composition...
6.16 Example: NZ kelp holdfast macrofauna
We now consider the fully nested design, C(B(A)). In north-eastern New Zealand, examined assembl...
6.17 Example: Tees Bay macrofauna
The final example in this chapter is of a mixed nested and crossed design B$\times$C(A), for a to...
6.18 Recommendations
For typical species abundance matrices, it is much preferable to use a non-parametric ANOSIM-ty...