skbio.diversity.alpha.robbins#
- skbio.diversity.alpha.robbins(counts)[source]#
Calculate Robbins’ estimator for probability of unobserved outcomes.
Robbins’ estimator is defined as:
\[\frac{F_1}{n+1}\]where \(F_1\) is the number of singleton taxa.
- Parameters:
- counts1-D array_like, int
Vector of counts.
- Returns:
- double
Robbins’ estimate.
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.