The expit and logit functions are useful shortcuts when using logistic regression models.
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a real number
a number between 0 and 1, i.e. a probability
The logit function is defined as logit(p) = log(p)/log(1-p) and can also be described as the log odds of a given probability. The expit is the inverse of the logit function and is defined as expit(x) = exp(x)/(1+exp(x)).
A numeric value, possibly vectorized, depending on the input.
Nicholas G. Reich
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