chesson_alpha: Chesson's alpha, or Vanderploeg and Scavia's selectivity...
In electivity: Algorithms for Electivity Indices

These two functions calculate the same value; alpha and W are identical.

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chesson_alpha(r, p, na.rm = TRUE)

vs_select_coef(r, p, na.rm = TRUE)

`r`	(Numeric) Resource utilisation.
`p`	(Numeric) Resource availability.
`na.rm`	(Logical) If 'TRUE', 'NA's will be ignored when calculating the selectivity coefficient (W).

A numeric vector.

data(moth_distrib)

chesson_alpha(moth_distrib$r, moth_distrib$p)
vs_select_coef(moth_distrib$r, moth_distrib$p)

electivity documentation built on Aug. 20, 2019, 5:11 p.m.

electivity index

README.md

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