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Monthly Archives: December 2013

It’s not great, but, as my mother-in-law sometimes says, it’ll do in the dark:

\Phi\left(x\right)\approx\tilde{\Phi}\left(x\right)=\frac{\phi\left(0.87x-0.89\right)}{2\phi\left(0.89\right)},\,-3\le x<0.

normal_cdf_approximation_error
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In the Dark

A blog about the Universe, and all that surrounds it

Minds aren't magic

Paul Crowley

Mad (Data) Scientist

Musings, useful code etc. on R and data science

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The Accidental Statistician

Occasional ramblings on statistics

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Data Colada

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Xi'an's Og

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