Work out species diversity (shannon) instantly with clear inputs, formula shown and shareable results.
Sums the proportional abundances times their logarithms to give the Shannon index, with evenness and the effective number of species.
Shannon index
H = -sum(pi x ln pi); evenness = H / ln(S); effective species = e^H
Uncertainty in predicting the species of a randomly drawn individual, combining richness and evenness.
The exponential of H is in intuitive species units and behaves linearly when communities are combined.