DATA:      Van den Brink et Ter Braak (1998a)
DIRECTORY: \CANOCO\SAMPLES\PERMUTIO\PRC
PROBLEM:   What is the response across time of an invertebrate community to
           different dosages of an insecticide?
ILLUSTRATION OF:
+ Testing the significance of the first PRC diagram
+ Testing the significance of the second PRC diagram
_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | species.dta   | log-counts of invertebrate species in 12 
             |               |  experimental ecosystems (mesocosms)
ENVIRONMENT  | design.dta    | design data file with 5 treatment (ds0-ds4) 
             |               |  and 11 time indicators of which two Before 
             |               |  (Wk-4 - Wk-1) and 9 After (Wk0.1 - Wk24) 
             |               |  treatment at Wk0
 DERIVED     | dsgnax1.dta   | design file with the first environment axis of
             |               |  prctest1.sol added
 PROJECTS    | prc.con       | PRC of Fig.3 of the paper with test of 
             |               |  first axis (first PRC diagram)
             | prctest1.con  | as above with deletion of the pre-treatment 
             |               |  variables
             | prctest2.con  | PRC test of the second axis (second PRC diagram)
             |               |  using dsgnax1.dta
             | prctst2.con   | first, automatic part of the PRC test of
             |               |  the second axis using the command version
             |               |  of CANOCO
             | prctst2b.con  | second part of PRC test of the second axis 
             |               |  using the command version of CANOCO
             | prctst2c.con  | first and second part to give a PRC test of
             |               |  the first and second axis using the command
             |               |  version of CANOCO
-------------+---------------+-------------------------------------------------

Van den Brink, P.J. & Ter Braak, C.J.F.(1998a): Principal Response Curves:
Analysis of time-dependent multivariate responses of a biological community
to stress. Environmental Toxicology and Chemistry, in press.