Simpson Index D
Compute the Simpson diversity index D for three species counts in a sample.
Description
Compute the Simpson diversity index D for three species counts in a sample.
Simpson Index D is a focused biology tool that compute the Simpson diversity index D for three species counts in a sample. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use Simpson Index D
Use Simpson Index D when you need to compute the Simpson diversity index D for three species counts in a sample. Enter Species A count, Species B count, and Species C count using the definitions and units below so the result can be reproduced.
- Species A count
- An integer count or setting greater than or equal to 0.
- Species B count
- An integer count or setting greater than or equal to 0.
- Species C count
- An integer count or setting greater than or equal to 0.
How Simpson Index D calculates the result
The published tool contract uses this rule: Compute the Simpson diversity index D for three species counts in a sample.1
- Simpson index D
- The calculated simpson index d.
Limitations of Simpson Index D
The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.
Alternative or Complementary measurements
Retain the original Species A count, Species B count, and Species C count values and their units alongside the result. Brillouin Index is useful when you instead need to compute the Brillouin diversity index HB = (ln(N!) - sum(ln(ni!))) / N from three species counts using loop-based log factorials for communities up to 10000 individuals. McIntosh Index provides another view by helping you compute the McIntosh diversity index for a three species community from Euclidean distance in species space.
References
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Diversity index — Wikipedia contributors
Similar or alternative tools
- Brillouin Index
Compute the Brillouin diversity index HB = (ln(N!) - sum(ln(ni!))) / N from three species counts using loop-based log factorials for communities up to 10000 individuals.
- McIntosh Index
Compute the McIntosh diversity index for a three species community from Euclidean distance in species space.
- Shannon Wiener H
Compute the Shannon-Wiener diversity index from up to five species proportions.