88
Community Analysis Package
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:
a/N
17.12 Kulczynski
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:
a/(b + c)
17.13 S13
For measures of similarity between samples based on species presence absence
the observations can be summarised in a simple frequency table:
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