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
:
where \(p_i\) is the proportion of the community represented by OTU \(i\).
Parameters: | counts : 1-D array_like, int
|
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Returns: | double
|
See also
Notes
The implementation here is 1 - dominance
as described in [R48]. Other
references (such as [R49]) define Simpson’s index as 1 / dominance
.
References
[R48] | (1, 2) http://folk.uio.no/ohammer/past/diversity.html |
[R49] | (1, 2) http://www.pisces-conservation.com/sdrhelp/index.html |