SAS files used for fuzzy set ordination
Ecological Archives E089-075-S1.
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Richard L. Boyce
Department of Biological Sciences
Northern Kentucky University
Nunn Drive
Highland Heights, KY 41099
United States
Tel.: +1-859-572-1407
Fax: +1-859-572-5639
Email: boycer@nku.edu
fso_SAS.zip--zip file containing SAS and data files.
see Download page for individual files.
These are SAS programs to run fuzzy set ordination. The abundance programs take raw elevations and transform them to fuzzy sets that range from 0 to 1. I have also trimmed the abundance data set down to 100 sites, as it runs much faster. The elevation data set for the binary programs has already been transformed to a fuzzy set; if you need to use raw elevations, just copy the transformation routine from the abundance programs.
For binary (presence/absence) FSO: You may use either the program with the step-across routine (binary-stepacross.sas) or without it (binary.sas). Step-across is good to use if beta diversity is high in your data set; however, it will take about 3× longer to run. Note that both of these files use the Jaccard index. The presence/absence data set (binary.dat) and the elevation data set (binelev.dat) are both described in: R. L. Boyce and P. C. Ellison. 2001. Choosing the best similarity index when performing fuzzy set ordination on binary data. Journal of Vegetation Science 12:711720.
For abundance FSO: You may use either the program with the step-across routine (abund-stepacross.sas) or without it (abund.sas). Note that both of these files use percent similarity for the similarity index. The relative abundance data set (abund.dat) and the elevation data set (abundelev.dat) are both described in: Boyce, R. L. 1998. Fuzzy set ordination along an elevation gradient on a mountain in Vermont, USA. Journal of Vegetation Science 9:191200.
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