skbio.diversity.alpha.simpson¶
- skbio.diversity.alpha.simpson(counts)[source]¶
Calculate Simpson’s index.
State: Experimental as of 0.4.0.
Simpson’s index is defined as
1 - dominance
:\[1 - \sum{p_i^2}\]where \(p_i\) is the proportion of the community represented by OTU \(i\).
- Parameters
counts (1-D array_like, int) – Vector of counts.
- Returns
Simpson’s index.
- Return type
double
See also
Notes
The implementation here is
1 - dominance
as described in 1. Other references (such as 2) define Simpson’s index as1 / dominance
.References