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Variability weighting
Pre-treatment>Variability Weighting is a new option in PRIMER 7, which bears similarities to the ...
Other variable weighting
There are other cases in which variables (species) might need prior weighting, e.g. when a specie...
(Fal estuary copepods)
Sediment copepod assemblages (and other fauna) from five creeks of the Fal estuary, SW England, w...
Dispersion weighting of species
When variables are on different measurement scales, there is little viable alternative to normali...
Normalising variables
It is typical of a suite of physico-chemical variables (or biomarkers, water-quality indices etc....
Transforming (individual)
Both the Draftsman and Histogram Plots show that several of the Ekofisk abiotic variables are hig...
Draftsman, histogram & multi-plots
Temporarily deselect the Distance (as in Section 3), and run Plots>Draftsman Plot on the other 9 ...
Transforming abiotic variables
Transformations may be appropriate for environmental variables too, though usually for a differen...
Shade plots to aid choice of transform
A major new feature in PRIMER 7 is the large number of additional plotting routines, one of the c...
A2 References
Akaike (1973) Akaike H. 1973. ‘Information theory as an extension of the maximum l...
Transforming (overall)
Transformation is usually applied to all the entries in an assemblage matrix of counts, biomass, ...
Standardising species
Pre-treatment>Standardise can also be used to standardise the matrix on the variables axis, e.g. ...
Stats to worksheet
Several of the routines in PRIMER 7 also incorporate a check box for sending summary statistics u...
Selection in resemblance matrices
Looking ahead to Section 5, when the active window is a (triangular) resemblance matrix, selectio...
Selecting by ‘most important’
There are, however, three other selection methods under Select>Variables that are specific to sel...
Selecting variables
Any of the options for selecting samples are also available for selecting variables, e.g. selecti...
Selecting by number and non-missing
It may sometimes be easier to use the sample numbers, here Select>Samples>•Sample numbers> 1,2,5,...
Multiple selections
It is important to note the effect of this second selection on WA fish diets %vol; it produces a ...
Selecting by factor levels
The highlighting route to selection can be bypassed altogether using the other options on the Sel...
Selecting & deselecting highlights
When all except columns A9, B3 and B4 are highlighted, take Select>Highlighted. Alternatively, ri...