PCORD software comes with a 28 page booklet for getting started. The
PCORD contextsensitive help system has a more
extensive text describing the programs available in PCORD,
focusing on the mechanics of running the programs. It does not say much about the rational
for using a particular analysis and why.Some useful references to help you decide what
is appropriate for your data are McCune and Grace (2002), Beals
(1984), Gauch (1982), Tabachnik and Fidell (2001), and GreigSmith (1983), and Ludwig and
Reynolds (1988). Gauch's book is a good introduction to the techniques developed at
Cornell, and is still a good introduction to community analysis in general. Beals (1984)
contains a penetrating critique of distance measures and ordination techniques from an
ecological viewpoint. Clarke (1993) is an excellent, though somewhat dated, summary of the
use of nonparametric techniques in ecology, for example nonmetric multidimensional
scaling. Legendre and Legendre (1998) provides the most exhaustive survey of these
techniques with a more mathematical presentation.




Trademark: The essence of multivariate
analysis is the extraction of a small number of important relationships from a very large
number of possible relationships. The PCORD trademark
on the cover symbolizes bringing to the foreground those few important relationships from
all the possible relationships found in the background data. 