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Re: st: significance test for change


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: significance test for change
Date   Tue, 8 Dec 2009 19:39:39 +0000 (GMT)

--- On Tue, 8/12/09, P C <calicep@yahoo.com> wrote:
> I have a survey data set. In this variable I have a
> race/ethnicity variable, and a dependent variable (obesity
> which is a dichotomous variable: obese=1; not obese=0). I
> have two waves of data for obesity. 
> 
> At wave 1, I calculate percentage of obese respondents for
> each race/ethnic group. Then at Wave 2, I do the same thing.
> Now I want to know the change for the percentage of obese
> respondents for each racial group is significant or not. I
> also need to know the confidence interval of change. 

These proportions are just means, so you can use -regress- of
obesity on wave with the -svy- prefix and the appropriate 
-subpop- option. The "effect" of the wave dummy is the change
in the percentage within a racial group. Alternativly you 
could use -logit- with the appropriate -svy- prefix and 
-subpop- option in combination with -margins-. This might
reasure people (referees, advisors, etc.) who don't like the 
linear probability model, it should give very similar results
though.

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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