I am using pnorm() with the log.p=T argument to get approximations to ln
\Phi(x) and qnorm with the log.p=T argument to get estimates of
\Phi^{-1}(exp(x)). What approximations are used in these two functions (I
noticed in the source pnorm.c it doesn't look like Abramowitz and Stegen) and
where can I find the citation?
Thanks,
Richard Morey
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