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Re: st: erfc function


From   "Heyman, James E." <JEHEYMAN@stthomas.edu>
To   "<statalist@hsphsun2.harvard.edu>" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: erfc function
Date   Wed, 2 May 2012 13:45:43 +0000

Thanks much.  In retrospect, I would have saved a lot of time going for a bespoke solution rather than searching for a built-in one.



James E. Heyman, PhD
Associate Professor of Marketing
University of St. Thomas
Opus College of Business
1000 LaSalle Ave (TMH443N)
Minneapolis, MN  55403

   ___o
  `\  <,_
@ /  @


On May 2, 2012, at 1:49 AM, Maarten Buis wrote:

--- 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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