# skbio.diversity.alpha.margalef¶

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

Calculate Margalef’s richness index.

State: Experimental as of 0.4.0.

Margalef’s D is defined as:

$D = \frac{(S - 1)}{\ln N}$

where $$S$$ is the number of OTUs and $$N$$ is the total number of individuals in the sample.

Assumes log accumulation.

Parameters

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

Returns

Margalef’s richness index.

Return type

double

Notes

Based on the description in 1.

References

1

Magurran, A E 2004. Measuring biological diversity. Blackwell. pp. 76-77.