skbio.diversity.alpha.simpson#
- skbio.diversity.alpha.simpson(counts)[source]#
Calculate Simpson’s diversity index.
Simpson’s diversity index, a.k.a., Gini-Simpson index, or Gini impurity, is defined as
\[1 - \sum{p_i^2}\]where \(p_i\) is the proportion of the sample represented by taxon \(i\).
Therefore, Simpson’s diversity index is also denoted as \(1 - D\), in which \(D\) is the Simpson’s dominance index.
- Parameters:
- counts1-D array_like, int
Vector of counts.
- Returns:
- double
Simpson’s diversity index.
See also
Notes
Simpson’s diversity index was originally described in [1].
References
[1]Simpson, E. H. (1949). Measurement of diversity. Nature, 163(4148), 688-688.