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Re: st: RE: Interpreting qreg results - Does anyone know?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Interpreting qreg results - Does anyone know?
Date   Tue, 25 Feb 2003 06:45:42 -0800 (PST)

--- Nick Cox <n.j.cox@durham.ac.uk> in reply to my
post asking if -qreg mpg foreign- followed by
-test foreign- tests the null that the MEDIANS of the
two groups (foreign and domestic)are the same? wrote:

> 1. Yes, in this circumstance it bears this
> interpretation given the relationship between the
> median and minimising sums of absolute deviations. 
> 
> 2. But it's not a test that I would want to run
> with. The double exponential model, while a  
> numerically tractable and appropriate model to work
> with when being moderately pessimistic  about the 
> tails of an error distribution, is not often a very
> realistic model when comparing two data 
> distributions. 

Now, if I include another variable in the model such
as -price-, in the case of linear regression I can
interpret the results from -test foreign- as a ttest
of foreign adjusted for -price-. Does this
interpretation also applies to -qreg- except with
respect to medians? Or is there a better way to
compare adjusted medians?

Best,
Ricardo.   

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