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st: RE: per standard deviation change


From   "Martin Weiss" <martin.weiss@uni-tuebingen.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: per standard deviation change
Date   Thu, 11 Sep 2008 13:49:07 +0200

Sounds like a case for -regress- with the -beta- option.



HTH
Martin



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Mohammed El
Faramawi
Sent: Thursday, September 11, 2008 1:36 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: per standard deviation change 

Hi,
I want to ask about modeling a continuous variable as per standard deviation
change. For example if I have a continuous variable such as arterial blood
pressure(BP) measured in mmhg and I want to express the relationship between
per standard deviation change of blood pressure  and the physical activity
(coded yes, no). How can I do that? Should I calculate the mean of BP abd
then subtract it from the individual observation then divide the product by
standard deviation.
 Or should I subtract the standard deviation from the individual
observation? 
Also, Should I take the absolute variable when the new variable is created
or should I keep the signs when the regression is conducted?
Thank you.



      
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