Nothing
`rc` <-
function(coefs)
{
stopifnot(is.numeric(coefs), length(coefs) == 3,
all(names(coefs) == c("alpha", "beta", "gamma")))
rho <- (coefs[3] - coefs[1])/(coefs[2] - coefs[1]) - 1
unname(-log(rho)/12)
}
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