Where:
Si is the number of species with IUCN status i (for example, Si would represent the number of LC species),
Wi is the weight or score associated with IUCN status i,
n is the number of different IUCN status categories.
Using data for n=5n = 5n=5 (LC, NT, VU, EN, CR):
LIC: 36 species, score = 1
NT: 3 species, score = 2
Example:
Then the Relative Species Value could be calculated as:
(36×1)+(3×2)+(3×3)+(2×4)+(1×5)=64
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