Nothing
library(qwraps2)
set.seed(42)
p <- runif(100)
stopifnot(all.equal(logit(p), log(p/(1-p))))
stopifnot(all.equal(invlogit(log(p/(1-p))), p))
x <- seq(-3, 3, length = 1001)
stopifnot(all.equal(invlogit(x), plogis(x)))
x <- seq(sqrt(.Machine$double.eps), 1 - sqrt(.Machine$double.eps), length = 1001)
stopifnot(all.equal(logit(x), qlogis(x)))
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