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Re: st: erfc function
From
Christophe Kolodziejczyk <[email protected]>
To
[email protected]
Subject
Re: st: erfc function
Date
Thu, 3 May 2012 08:36:16 +0200
A minor point, but shouldn't it be
2*normal(-x*sqrt(2))
see http://en.wikipedia.org/wiki/Error_function
2012/5/2 Maarten Buis <[email protected]>
>
> --- On Wed, May 2, 2012 at 12:51 AM, Heyman, James E. wrote:
> >> I feel like an idiot for asking but can somebody please tell me where the erfc (complementary error function) is in Stata?
>
> --- On Wed, May 2, 2012 at 2:07 AM, Nick Cox wrote:
> > Look at e.g.
> >
> > . twoway function 2 * (1 - normal(x)) , ra(-10 10)
>
> Alternatively:
>
> twoway function 2 * normal(-x) , ra(-10 10)
>
> With this version you are a bit less likely to be bitten by precision
> problems, see:
>
> William Gould (2006) Mata Matters: Precision, The Stata Journal, 6(4): 550-560.
> <http://www.stata-journal.com/article.html?article=pr0025>
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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--
Christophe Kolodziejczyk
Research Fellow
AKF, Anvendt KommunalForskning
Danish Institute of Governmental Research
Købmagergade 22
DK-1150 København K
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