First derivative of the Inverse(Double)
function expressed in terms of it's output.
Accord.Statistics (in Accord.Statistics.dll) Version: 3.8.0
The first derivative of the identity link function in terms
of y = f(x) is given by f'(y) = exp(c - x * x * 0.5)
in which c = -log(sqrt(2*π)
and x =