logit

Etymology
, by analogy with, coined by Joseph Berkson in 1944: “I use this term [logit] for $$\ln p/q$$ following Bliss, who called the analogous function which is linear on $$x$$ for the normal curve ‘probit.’”

Noun

 * 1)  the inverse of the "sigmoid" or "logistic" function used in mathematics, especially in statistics. The logit of a number p between 0 and 1 is given by the formula:
 * $$\operatorname{logit}(p)=\log\left( \frac{p}{1-p} \right) =\log(p)-\log(1-p). \!\,$$