DATA: van Wijngaarden (unpublished) DIRECTORY: \CANOCO\SAMPLES\PERMUTIO\BACI3SIT PROBLEM: Testing the effect of a toxicant on a species assemblage in a three-site BACI design ILLUSTRATION OF: + How to interpret the fit-diagnostics of species in the solution file + Details of the Take and Skip rule when some samples are deleted _______________________________________________________________________________ FILE TYPE | FILE NAME | DESCRIPTION -------------+---------------+------------------------------------------------- SPECIES | species.dta | 59 species in three ponds sampled once in | | consecutive months ENVIRONMENT | toxicant.dta | treatment indicators of the pond (Control, Low | | and High dose) and coded as 0,1,2 in the | | variable Toxlevel COVARIABLES | pondtime.dta | pond and time indicators PROJECTS | bacirda1.con | permutation test of "no impact" against a | | "level of impact" model (linear in Toxlevel | | using 1 degree of freedom) | bacirda2.con | permutation test of "no impact" against an | | "impact per dose dosage class" model (2 degrees | | of freedom) | bacirda3.con | as bacirda1.con but after deleting a species | | that had extreme influence on the analysis | | (species 8, clo dip) | baci_c_h.con | re-analysis of Example 8.3.8 by deleting | | the data from the Low-impact pond -------------+---------------+-------------------------------------------------