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st: Interpreting qreg results.


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Interpreting qreg results.
Date   Sun, 23 Feb 2003 15:03:01 -0800 (PST)

Dear all;

Linear regression results, for a dichotomous variable,
are comparable to those of a ttest. That is if I
regress

. regress  mpg foreign

The model F(1,72) =  13.18, Prob > F =  0.0005

as expected, is the same as that obtained from the
t-test. That is, the t-test and the above regress
tests the null that the means of the two groups
(foreign and domestic)are the same.

Can I interpret the results from -qreg- in the same
way. If I type

. qreg mpg foreign

followed by
. test foreign

does this test the null that the MEDIANS of the two
groups (foreign and domestic)are the same?

Best,
Ricardo.


=====
Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK

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