logit {HH}

Logistic and odds functions and their inverses.

Description

Logistic and odds functions and their inverses.

Usage

logit(p)
antilogit(x)

odds(p)
antiodds(o)

Arguments

p

Probability value, a vector of numbers between 0 and 1, inclusive.

x

Real number, a vector of numbers between -Inf and Inf.

o

Real number, a vector of numbers between 0 and Inf.

Value

Vector of real values log(p/(1-p)) for logit. Vector of probabilities exp(x)/(1+exp(x)) for antilogit with boundary values of -Inf and Inf for x correctly handled. Vector of real values p/(1-p) for odds. Vector of probabilities o/(o+1) for antiodds with the boundary value of Inf for o correctly handled.

Author(s)

Richard M. Heiberger <[e-mail]>

Examples

logit(seq(0, 1, .1))
antilogit(logit(seq(0, 1, .1)))

odds(seq(0, 1, .1))
antiodds(odds(seq(0, 1, .1)))