PiscesLogoSmallerStill Reciprocal averaging (RA)

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Reciprocal Averaging (also termed Correspondence Analysis) and an adjusted version called Detrended Correspondence Analysis (DECORANA) are the final types of ordination method that are frequently used. They are best used on quantitative data, although they can give good results with classed abundance data. Both of these methods are particularly effective when it is suspected that the sites (samples) can be arranged along an environmental gradient. Further, the method allows the site and variable (e.g. species) ordinations to be plotted on the same figure, which allows the influence of the variables in determining the ordination of the samples to be uncovered.