Calculators and formulas for the Logit function, the inverse function of the Sigmoid function
This page contains an online calculator for the logit function. The logit function is the inverse function of the logistic sigmoid function.
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The curve of the logit function
The logit function is the inverse function of the logistic sigmoid function or S function. The following figure shows the S-shaped graph of the sigmoid function.
The logit function is described by the following equations.
\(\displaystyle sig^{-1}(y)= -ln\left(\frac{1}{y}-1\right)\) \( = ln\left(\frac{y}{1-y}\right)\) \(=2·arctanh(2·y-1)\)
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