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Re: st: erfc function


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: erfc function
Date   Wed, 2 May 2012 08:49:03 +0200

--- 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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