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# skbio.diversity.alpha.osd

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

  Calculate observed OTUs, singles, and doubles.

  State: Experimental as of 0.4.0.

  Parameters: | counts (1-D array_like, int) – Vector of counts.
  Returns: | osd – Observed OTUs, singles, and doubles.
  Return type: | tuple

  See also

  `observed_otus()`, `singles()`, `doubles()`

  Notes

  This is a convenience function used by many of the other measures that rely on these three measures.