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st: RE: Adjusted mean.


From   "Scott Merryman" <smerryman@kc.rr.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Adjusted mean.
Date   Mon, 3 May 2004 20:33:24 -0500

How about if you regressed expenditures on the socio-demographic variables
and then used -adjust- to get the adjusted means.

For example, using the auto dataset deriving the average weight adjusted for
length and car origin.


. sysuse auto
(1978 Automobile Data)

. qui reg weight length foreign

. adjust length if fore == 0, by(fore) se ci

----------------------------------------------------------------------------
     Dependent variable: weight     Command: regress
  Covariate set to mean: length = 196.13461
----------------------------------------------------------------------------

----------------------------------------------------------
 Car type |         xb        stdp          lb          ub
----------+-----------------------------------------------
 Domestic |    3317.12   (34.7036)    [3247.92    3386.31]
----------------------------------------------------------
     Key:  xb         =  Linear Prediction
           stdp       =  Standard Error
           [lb , ub]  =  [95% Confidence Interval]


. adjust length if fore == 1, by(fore) se ci

----------------------------------------------------------------------------
Dependent variable: weight     Command: regress
  Covariate set to mean: length = 168.54546
----------------------------------------------------------------------------

----------------------------------------------------------
 Car type |         xb        stdp          lb          ub
----------+-----------------------------------------------
  Foreign |    2315.91   (53.3538)    [2209.52    2422.29]
----------------------------------------------------------
     Key:  xb         =  Linear Prediction
           stdp       =  Standard Error
           [lb , ub]  =  [95% Confidence Interval]

.
Hope this helps,
Scott
  

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Puneet K Singhal
Sent: Monday, May 03, 2004 10:20 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Adjusted mean.

For a group of individuals, I have their socio-demographic variables and 
health care expenditures per month for a year.  I wanted to get their mean 
expenditures per month adjusted for sociodemographic variables.  How do I do

it?  Any help?  Thanks.

Puneet


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