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


From   Marcos Vinicius <bioestatistico@inbox.com>
To   STATA LIST <statalist@hsphsun2.harvard.edu>
Subject   st: obtain SD from P value for a paired t-test
Date   Tue, 1 Oct 2013 08:09:55 -0800

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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