Gives a measure of the species divesity in the fossil data.
Hill.N2 from the rioja package
Minimum, first quartile and median effective number of species
If the effective number of species is small, WA based reconstructions are unlikely to be significant, and MAT based reconstructions should be tested instead.
Hill, M. O. (1973) Diversity and evenness: a unifying notation and its consequences. Ecology 54: 427–432.
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