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Re: st: obtain SD from P value for a paired t-test


From   Richard Goldstein <[email protected]>
To   [email protected]
Subject   Re: st: obtain SD from P value for a paired t-test
Date   Tue, 01 Oct 2013 13:04:47 -0400

if you know N also, you can use the formula given in the Stata manual
(methods and formulas section of the ttest entry in the reference
manual), or many texts, to get the sd - if you don't know N, the best
you can do is an approximation

Rich

On 10/1/13 12:09 PM, Marcos Vinicius wrote:
> Hello,
> Anyone knows a way to obtain  standard deviation(sd) from P value for a paired t-test.?
> Consider that I know:
> Average pre
> SD pre
> Average post
> SD post (to be determined from others parameters)
> P value from paired t test 
> 
> Average pre=6.5
> SD pre=1.8
> Average post =4.9
> SD post ??(to be determined from others parameters)
> P value from paired t test p=0.0003
>  Any help would be greatly appreciated
> Thanks
> Vinicius
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