skbio.diversity.alpha.simpson_e

skbio.diversity.alpha.simpson_e(counts)[source]

Calculate Simpson’s evenness measure E.

State: Experimental as of 0.4.0.

Simpson’s E is defined as

\[E=\frac{1 / D}{S_{obs}}\]

where \(D\) is dominance and \(S_{obs}\) is the number of observed OTUs.

Parameters:

counts (1-D array_like, int) – Vector of counts.

Returns:

Simpson’s evenness measure E.

Return type:

double

See also

dominance, enspie, simpson

Notes

The implementation here is based on the description given in [1].

References