From "Scott Merryman" To 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

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

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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```