Computes the Chao species estimator for both
a vector of positive integers or zero of any length
This function is typically only called internally by the functions
chao2. The function has a built in bias correction, such that it
will not return values of infinity or non-numbers.
Estimated numer of species using the Chao estimator.
Chao, A. 1984. Nonparametric estimation of the number of classes in a population. Scandinavian Journal of Statistics 11: 265-270.
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Loading required package: sp Loading required package: maps Loading required package: shapefiles Loading required package: foreign Attaching package: 'shapefiles' The following objects are masked from 'package:foreign': read.dbf, write.dbf  14.5  7
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