Procs

proc cdfGaussian(mu = 0.0; sigma = 1.0; x = 0.0): float {...}{.raises: [], tags: [].}

Winitzki (2008)

A Handy Approximation for the Error Function and its Inverse (https://www.academia.edu/9730974/A_handy_approximation_for_the_error_function_and_its_inverse)