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.
counts (1-D array_like, int) – Vector of counts.
Robbins’ estimate.
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
Robbins, H. E (1968). Ann. of Stats. Vol 36, pp. 256-257.