Similarity measures
89
Sam
Species Present
Sample 2
Species Present
a
Species  Absent
c
where the number of species present in both samples is a, the number of species
present in sample 1 but missing from sample 2 is b, the number of species
missing in sample 1 but present in sample 2 is c and the number of species
missing from both samples is d. The total number of species, N, is therefore
a+b+c+d.
This measure is:
17.14 Ochiai
For measures of similarity between samples based on species presence absence
the observations can be summarised in a simple frequency table:
Sam
Species Present
Sample 2
Species Present
a
Species  Absent
c
where the number of species present in both samples is a, the number of species
present in sample 1 but missing from sample 2 is b, the number of species
missing in sample 1 but present in sample 2 is c and the number of species
missing from both samples is d. The total number of species, N, is therefore
a+b+c+d.
This measure is:
17.15 Q1
This is simply the agreement (number of species which have the same
abundance in the two samples) divided  by the total number of species.
Example:  Ten species at two sites:
Copyright 2004, PISCES CONSERVATION LTD





Actions web hosting footer




 

 

 

 

Home | About Us | Network | Compare Plans | Support | FAQ | Control Panel | Order Online | Sitemap | Contact

Terms Of Service

cheap web hosting

 

Our web partners: Web Hosting PHP Jsp Web Hosting Java Web Hosting Jsp Web Hosting Cheapest Web Hosting  Java Web Hosting

Cheap Web Hosting Java Hosting Cheapest Hosting Quality Web Templates Best Web Templates Web Design Templates

Java Web Hosting Cheap Hosting Cheap Web Hosting Jsp Web Hosting Tomcat Web Hosting

Quality Web Hosting Best Web Hosting Java Web Hosting

Actionswebhosting.com Business web hosting division of Vision Web Hosting Inc. All rights reserved.