 Mills ratio (source code)

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= Mills ratio
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For the <standard normal density> $\phi$ and <cumulative distribution function>[distribution function] $\Phi$, the upper-tail <Mills ratio> is $(1-\Phi(x))/\phi(x)$. Ratios involving a Gaussian <probability density function>[density] and <Tail probability> control truncated-normal <moments> and Gaussian-tail asymptotics.

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