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RE: st: Standardized Response Mean. Does Stata calculate this?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Standardized Response Mean. Does Stata calculate this?
Date   Tue, 15 Nov 2005 23:41:19 -0000

In Stata terms, 

gen diff = y - x
su diff 
di r(mean) / r(sd) 

Nick 
n.j.cox@durham.ac.uk 

James Shaw
 
> The standardized response mean (SRM) is one of several
> available effect size indices used to gauge the
> responsiveness of scales to clinical change.  The SRM
> is computed by dividing the mean score change (i.e.,
> follow-up minus baseline) by the standard deviation of
> the change.  Other effect size indices use the
> standard deviation at baseline (Cohen's D) or the
> standard deviation for clinically stable individuals
> (responsiveness statistic) in the denominator.  
> 
> The independent groups' t statistic can be used as an
> index of responsiveness in trials comparing treatment
> with control.  One simply divides the difference in
> change scores between treatment groups by the standard
> error of the difference between the group means.

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