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Coefficient of Community- 2

`CC = c/S`
`(C)"Number of species common to both communities"`
`(S)"Total number of species found in the two communities"`
Tags
Ecology

The Coefficient of Community calculator computes the ratio of the number of species common to two community compared to the total species in both communities.

INSTRUCTIONS: Enter the following:

  • (C) The number of species common to both communities.
  • (S) The combined number of unique species in both communities.

Coefficient of Community (CC): The calculator returns the coefficient as a real number.

The Math / Science

The Coefficient of Community (Jaccard Coefficient) is a coefficient that indicates the degree of similarity of two communities based on the number of species that they have in common.  The formula for coefficent of community is:

   CC = C / S

where:

  • CC = Coefficient of Community
  • C = the number of species common to both communities
  • S =  the total number of species found in the two communities

A more common version of the Coefficient of Community (Jaccard Coefficient) is a coefficient that indicates the degree of similarity of two communities based on the number of species that they have in common.  The formula for the Coefficient of Community is:

       `"CC" = c/(S_1+S_2-c)`

where:

  • CC is the Jaccard Coefficient of Community 
  • S1 is the number of species in community 1
  • S2 is the number of species in community 2
  • c is the number of species in common between community 1 and community 2

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