Margalef's richness index
Margalef's richness index
margalef(x)
x |
A numeric vector of species counts. |
For a vector x of species counts, Margalef's index is
D = \frac{S -1}{\log N},
where S is the total number of species observed and N is the total number of counts.
This index is appropriate only for raw counts, not transformed counts or proportions.
Equivalent to margalef() in skbio.diversity.alpha.
The value of Margalef's index, D ≥q 0. This index is
undefined when the total number of counts is 1 or 0, in which case we
return NaN.
Margalef R. Information theory in ecology. General Systems 3. 1958;36-71.
x <- c(15, 6, 4, 0, 3, 0) margalef(x)
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