Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
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
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index