chao1 | R Documentation |
Computes the Chao 1 richness estimator, its estimated variance, and the corresponding 95
chao1(x)
x |
Vector of species abundances. |
Different equations are used to compute the classic Chao1 richness estimator, its estimated variance, and the corresponding 95
A data frame with five columns including the observed number of species (Sobs), the estimated number of species with the Chao 1 estimator (S.chao1), the estimated variance (var), and the upper and lower 95
Luis Cayuela
Chao, A. (1987). Estimating the population size for capture-recapture data with unequal catchability. Biometrics 43, 783-791.
specpool
abund <- c(19, 12, 7, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) print(chao1(abund))
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