Counts the number of species observed the same number of times.
A numeric vector containing species abundances.
The Abundance Frequency Count (Chao et al., 2015) is the number of species observed each number of times.
It is a way to summarize the species distribution.
A two-column matrix. The first column contains the number of observations, the second one the number of species observed this number of times.
Eric Marcon <Eric.Marcon@ecofog.gf>
Chao, A., Hsieh, T. C., Chazdon, R. L., Colwell, R. K., Gotelli, N. J. (2015) Unveiling the Species-Rank Abundance Distribution by Generalizing Good-Turing Sample Coverage Theory. Ecology 96(5): 1189-1201.
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# Load Paracou data (number of trees per species in two 1-ha plot of a tropical forest # and their taxonomy) data(Paracou618) # Ns is the vector of abundances of the first plot Ns <- Paracou618.MC$Nsi[, 1] # Return the abundance frequency count (AbdFreqCount(Ns) -> afc) plot(afc, xlab="Number of observations", ylab="Number of species") lines(afc)