Splus/R functions developed by Philip Dixon

DISCLAIMER:

Generally, these are research quality programs. The only documentation is the set of inline comments. They have been debugged, but I can not provide any guarantee of correct calculation, application or interpretation.

Please send me an e-mail message if you find a problem.

These are poor examples of programming style. Most were originally written in Splus before objects and classes, so the interface is antiquated.

These functions require helper functions from a library of point process functions. Most functions work with either Splus/Spatial or the splancs library written by Barry Rowlinson and Peter Diggle. If you are working in R, the splancs package is available from CRAN.

Functions for:


  • Nearest neighbor contingency table analysis (Dixon 1994, Ecology) nntest.txt
  • Nearest neighbor contingency table analysis for more than 2 types (Dixon 2002, Ecoscience) mnntest.txt
  • Monte-Carlo approach to multitype nearest neighbor contingency tables (Dixon 2002, Ecoscience) mnnsim.txt
  • Swamp tree data used in Dixon (2002), 734 tree locations, 5 categories (4 species and other) goodplot1.txt