Description Usage Arguments Value
Effective Number of Taxa
1 | effective_richness(taxa.wide, index)
|
taxa.wide |
Taxonomic counts aggregated at the specific taxonomic classification (e.g., Order, Family, or Genus) in a wide data format. Use the wide function to prepare the data. |
index |
Requires "shannon" (Shannon Wiener Diversity Index) or "invsimpson" (Inverse Simpson's Diversity Index). |
This functions converts the common diversity indices values to effective richness, as outlined by Jost (2006). Effective richness is a richness value weighted by species evenness; the value represents the taxa richness of a perfectly even assemblage reuquired to produce an equivalent diveristy index value to the observed assemblage. Shannon Wiener Diversity is converted using the exponential function: exp(H') where: H'= Shannon Wiener Diversity
Inverse Simpsons Diveristy is converted using: 1/(1-(1/D)) where: D = vegan Inverse Simpson's Diversity Index (1/(sum(n/N)^2) ) n = the abundance of a particular taxon N = the total abundance of organisms
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