skbio.diversity.alpha.enspie¶

skbio.diversity.alpha.enspie(counts)[source]¶

Calculate ENS_pie alpha diversity measure.

State: Experimental as of 0.4.0.

ENS_pie is equivalent to 1 / dominance:

\[ENS_{pie} = \frac{1}{\sum_{i=1}^s{p_i^2}}\]

where \(s\) is the number of OTUs and \(p_i\) is the proportion of the community represented by OTU \(i\).

Parameters:	counts (1-D array_like, int) – Vector of counts.
Returns:	ENS_pie alpha diversity measure.
Return type:	double

See also

dominance()

Notes

ENS_pie is defined in [1].

References

[1]	Chase and Knight (2013). “Scale-dependent effect sizes of ecological drivers on biodiversity: why standardised sampling is not enough”. Ecology Letters, Volume 16, Issue Supplement s1, pgs 17-26.