Variable Selection
60
See 
Opening a data set
10.4
Working Environmental Data
This form allows the user to make a variety of changes to the raw
Sample/Environmental variables data prior to undertaking an analysis. Initially, the
user will be presented with a grid filled with the raw data; this can be adjusted using
the options in the panel below the data grid.
See 
Opening a data set
See the subjects below for further details of transformations etc
Data transformations
Relative adjustments
Dealing with zeros
Transposing data
10.5
Redundancy Analysis
Redundancy Analysis is an extension of multiple regression when there is more than
one response (species) variable. If there is only one species then RA reduces to a
simple multiple regression. It was first proposed by Rao (1964) but has been little
used by biologists. A good description of the procedure is to be found in
Legendre & Legendre (1998)
.
The input data comprises a biological data set of samples/species and another set of
environmental/explanatory variables. The results are normally presented as a biplot.
Working samples/species data
Sample/species data
Copyright 2004  PISCES Conservation Ltd





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