Compute the expit and logit of a numerical vector. Transform odds to probability.
expit(x)
logit(x)
odds(x)vector of real values.
A real vector corresponding to the expit, the logit or the odds of the input real values.
logit computes the logit function:
$$logit(p) = \log\frac{p}{1-p}$$
expit computes the expit function:
$$expit(x) = \frac{e^x}{1+e^x}$$
odds transform an odd into a probability.
$$odds(x) = \frac{x}{1-x}$$
Those functions become numerically unstable if evaluated at the edge or the definition range.