Recently Updated Pages
9.4 Recommendations
The transformation sequence in a multivariate analysis, corresponding to a progressive downweight...
9.3 Multivariate case
There being no necessity to transform to attain distributional properties, transformations play a...
9.2 Univariate case
For purely illustrative purposes, Table 9.1 extracts the counts of a single Thyasira species from...
9.1 Introduction
There are two distinct roles for transformations in community analyses: a) to validate statistica...
8.7 Multiple diversity indices
A large number of different diversity measures can be computed from a single data set and it is r...
8.6 Example: Plymouth particle-size data
Fig. 8.15 is from Coulter Counter data of particle-size distributions for estuarine water samples...
8.5 Multivariate tools used on univariate data
Ekofisk macrofauna: testing dominance curves Fig. 8.5b compares the averaged community samples fo...
8.4 Examples: Loch Linnhe and Garroch Head macrofauna
ABC curves for the macrobenthos at site 34 in Loch Linnhe, Scotland {L} between 1963 and 1973 are...
8.3 Examples: Garroch Head and Ekofisk macrofauna
Plots of geometric abundance classes along a transect across the Garroch Head {G} sewage-sludge d...
8.2 Graphical/distributional plots
The purpose of graphical/distributional representations is to extract information on patterns of ...
8.1 Univariate measures
A variety of different statistics (single numbers) can be used as measures of some attribute of c...
7.10 Bubble plots (plus examples)
Bubble plots Abundance (or density, biomass, area cover etc) for a particular species can be show...
7.9 Example: Tasmanian meiofauna
Another clear generalisation is to a 2-way rather than 1-way layout, illustrated by the 16 meiofa...
7.8 Species contributions to sample (dis)similarities – SIMPER
Dissimilarity breakdown between groups The fundamental information on the multivariate structure ...
7.7 Example: Ekofisk oil-field macrofauna
The 39 sites sampled for benthic infauna at different distances from an oil-field in the N Sea we...
7.6 Example: Garroch Head macrofauna
An example where the biotic sample axis could have sensibly been ordered according to an a prior...
7.5 Example: Bristol Channel zooplankton
This example, last seen in Chapter 3, consists of 24 (seasonally-averaged) zooplankton net sample...
7.4 Shade plots
An alternative to line plots, and a technique that can often be even more useful, in terms of the...
7.3 Example: Amoco-Cadiz oil spill
A second example of deriving sets of coherent species curves, this time temporal rather than spat...
7.2 Type 2 and type 3 SIMPROF tests
describe in full detail a range of useful SIMPROF tests, which they classify as Types 1, 2 and 3...