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Re: st: Re: Adjusting confidence intervals


From   Ilesh Patel <ipatel@jhsph.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: Adjusting confidence intervals
Date   Wed, 13 Oct 2004 08:44:54 -0400

Thank you Joseph. I do believe that age affects both the difficulty score
and overall health self-rating score.

Thanks again for any help anyone can provide.

Ilesh


On 13/10/04 12:25 AM, "Joseph Coveney" <jcoveney@bigplanet.com> wrote:

> Ilesh Patel wrote:
> 
> I have computed a difficulty score for a range of vision tasks and want to
> see if there is a difference in the mean score by self-rated overall health
> (scored from 1 =AD 4). Following is what I used:
> 
> Sort overall_hlth
> 
> by overall_hlth: ci diff_score
> 
> This gives me the mean difficulty score and it=B9s CI for each of the 4
> self-rated overall health groups. What command do I use in Stata to adjust
> the CI for age given that I think age affects both the difficulty score.
> 
> ----------------------------------------------------------------------------
> 
> The nature of the adjustment that you'd do would depend upon what you
> believe the nature of the functional relationship is between age and
> difficulty score.  In the simple case, it seems that you could first
> use -regress-, with both age and overall health self-rating score as
> predictors (independent variables), and then -adjust-; the latter has a -ci-
> option.
> 
> If, on the other hand, you meant to write ". . . age affects both the
> difficulty score *and the overall health self-rating score*," then you have
> issues for which others on the list will be capable to help.
> 
> Joseph Coveney
> 
> 
> 
> 
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Yours sincerely,

Ilesh Patel 


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