DATA:      De Lange (1972)
DIRECTORY: \CANOCO\SAMPLES\UNIMODAL\DYKE
PROBLEM:   How plant species in fresh-water dykes are related to water 
           chemistry and soil type
BOOKLET:   pp 76-68
ILLUSTRATION OF:
+ How to code and display a nominal variable (soil type).
+ How to select species for plotting.
+ How to inspect axes 3 and 4.
+ How to test the statistical significance of the relation between species 
  and environment.
+ How to evaluate the importance of (sets of) environmental variables.
_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | dyke_spe.dta  | occurrence (1/0) of 133 water plant species in 
             |               | 125 fresh water dykes
ENVIRONMENT  | dyke_env.dta  | 3 water chemistry variables and 3 soil type 
             |               | classes
 DERIVED     | chlorsor.txt  | Weighted Averages of species sorted on chloride
 PROJECTS    | dyke_dca.con  | DCA of plant species interpreted by 
             |               | environmental variables
             | dyke_cca.con  | CCA of plant species on all environmental 
             |               | variables
             | cca_dca.con   | project relating the CCA and DCA axes
             | testall.con   | significance test of species-environment 
             |               | relation
             | water.con     | CCA on water chemistry variables only
             | soil.con      | CCA on soil type only
             | forward.con   | forward selection
-------------+---------------+-------------------------------------------------

De Lange, L.(1972): An ecological study of ditch vegetation in the Netherlands.
Dissertation. University of Amsterdam, Amsterdam, The Netherlands.