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Re: st: erfc function
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: erfc function
Date
Wed, 2 May 2012 10:23:11 +0100
Good point. erfc(x) is better calculated that way.
Nick
On Wed, May 2, 2012 at 7:49 AM, Maarten Buis <[email protected]> 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>
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