Calculates the Mills ratio
Numeric. Value at which the Mills' Ratio is evaluated.
The function calculates the Mills' Ratio. Since the Mill's Ratio converges to zero for large positive z and infinity for large negative z. The range over which the logarithm of the Mill's ratio may be calculated is greater than that for which the Mill's ratio itself may be calculated.
The Mills' Ratio is
where Phi(z) and phi(z) are respectively the distribution function and density function of the standard normal distribution.
David Scott email@example.com, Jason Shicong Fu
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