3

ECOM II

1

Contents

Introduction

Getting started

System requirements

Installation

Quick guide to running a data set

General instructions

Common errors and problems

Using ECOM   Worked example

Entering your data

Maximum size of the data set and computation speed

Preparing large data sets in a spreadsheet program

Data entry from within ECOM

Demonstration data sets

Transforming and adjusting your data

Data transformations

Relativisations

Dealing with zeros

Transposing data

Transforming environmental variables

Data set statistics

Data set statistics

The available methods

Methods offered by ECOM

Changing graphs

Graph display options

Zooming and panning on graphs

Tips for improving graphical output

Output

The output screens

Sample Correspondence Check

Printing and output

Exporting tabulated data

Demos and Help

Demonstration version of ECOM

Contacting PISCES for help

References

Other Programs by PISCES Conservation Ltd

1.1

Introduction

ECOM offers a range of analytical techniques for visualising and ordering the

relationships in multivariate data commonly used by community ecologists including

Canonical Correspondence Analysis (CCA), Redundancy Analysis (RA) and Multiple

Regression (MR). Researchers in other fields such as palaeontology, archaeology and

Copyright 2004  PISCES Conservation Ltd