skbio.diversity.alpha.
robbins
(counts)[source]¶Calculate Robbins’ estimator for the probability of unobserved outcomes.
State: Experimental as of 0.4.0.
Robbins’ estimator is defined as:
where \(F_1\) is the number of singleton OTUs.
Parameters: | counts (1-D array_like, int) – Vector of counts. |
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Returns: | Robbins’ estimate. |
Return type: | double |
Notes
Robbins’ estimator is defined in [1]. The estimate computed here is for \(n-1\) counts, i.e. the x-axis is off by 1.
References
[1] | Robbins, H. E (1968). Ann. of Stats. Vol 36, pp. 256-257. |