st: Typo: approximation for binormal a la Gould, et.al.?

["Robert Duval" <rduval@gmail.com>]

Sorry there was a typo in my previous posting... here is the correct one

On 2/5/07, Robert Duval <rduval@gmail.com> wrote:
> Dear friends
>
> In the ml book (Gould, Pitblado and Sribney)  it is mentioned that
>
> 1-normal(a) is a poor numerical approximation for Pr(x>a) and instead
> they suggest using
>
> normal(-a).
>
> Does anyone knows of a similar expression for the bivariate normal
> case giving 1-Pr(x>a,y>b;rho) without using
>
> 1-binormal(a,b;rho)
>
> i.e. without using substractions (or additions) that make the
> approximation numerically poor.?
>
> Any help would be greatly appreciated.
>
> Robert
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