Harrison Beta
Compute Harrison's normalized beta-2 turnover for two sites as (S₁ + S₂ - 2C) / (S₁ + S₂), where C is shared richness. The result is zero for identical species sets and one for disjoint sets.
Description
Compute Harrison's normalized beta-2 turnover for two sites as (S₁ + S₂ - 2C) / (S₁ + S₂), where C is shared richness. The result is zero for identical species sets and one for disjoint sets.
Harrison Beta is a focused biology tool that compute Harrison's normalized beta-2 turnover for two sites as (S₁ + S₂ - 2C) / (S₁ + S₂), where C is shared richness. The result is zero for identical species sets and one for disjoint sets. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use Harrison Beta
Use Harrison Beta when you need to compute Harrison's normalized beta-2 turnover for two sites as (S₁ + S₂ - 2C) / (S₁ + S₂), where C is shared richness. The result is zero for identical species sets and one for disjoint sets. Enter Site A species, Site B species, and Shared species using the definitions and units below so the result can be reproduced.
- Site A species
- An integer count or setting greater than or equal to 0, expressed in species.
- Site B species
- An integer count or setting greater than or equal to 0, expressed in species.
- Shared species
- An integer count or setting greater than or equal to 0, expressed in species.
How Harrison Beta calculates the result
The published tool contract uses this rule: Compute Harrison's normalized beta-2 turnover for two sites as (S₁ + S₂ - 2C) / (S₁ + S₂), where C is shared richness. The result is zero for identical species sets and one for disjoint sets.1
- Harrison beta diversity
- The calculated harrison beta diversity.
Limitations of Harrison Beta
The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.
Alternative or Complementary measurements
Retain the original Site A species, Site B species, and Shared species values and their units alongside the result. Whittaker Beta Pairwise is useful when you instead need to compute pairwise Whittaker beta diversity between two sites as the mean site species richness divided by the number of shared species. Whittaker Beta Diversity provides another view by helping you compute Whittaker beta diversity betaW = gamma / mean alpha richness from two site species counts and their shared count.
References
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Species diversity — Wikipedia contributors
Similar or alternative tools
- Whittaker Beta Pairwise
Compute pairwise Whittaker beta diversity between two sites as the mean site species richness divided by the number of shared species.
- Whittaker Beta Diversity
Compute Whittaker beta diversity betaW = gamma / mean alpha richness from two site species counts and their shared count.
- Hill Number N0
Return the Hill number of order zero, which equals species richness and therefore passes the species count through unchanged.