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# skbio.diversity.alpha.margalef

`skbio.diversity.alpha.``margalef`(counts)

  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.