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Re: st: Re: Re: ST: one-tailed test


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Re: ST: one-tailed test
Date   Mon, 11 Oct 2004 09:01:26 -0500

At 09:42 PM 10/11/2004 +0800, Levy Lee wrote:
thanks, i am afraid that i mis-understand it before

thanks again
To clarify, if by "precise" you mean, is dividing the reported significance by 2 just an approximation, the answer is no. If by "precise" you mean, are the results accurate to enough decimal places, it depends on how many decimal places you want and need. A reported 2-tailed significance of .003 might correspond to a 1-tailed significance of .001 or .002 (e.g. it depends on whether the .003 is really .0034 or .0026), so if you want to have accuracy to 3 or more decimal places you should do what Nick or Kit suggest.


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Richard Williams, Notre Dame Dept of Sociology
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