isn't this easily done with the cotrast command?
Peter A. Lachenbruch,
Professor (retired)
________________________________________
From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Rubil Ivica [irubil@eizg.hr]
Sent: Thursday, November 22, 2012 5:23 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: testing linear combination of means
Dear Statalist members:
Suppose there are four variables: var1, var2, var3, var4. I need to test
whether
0.5 * [mean(var1) - mean(var2)] - 0.5 * [mean(var3) - mean(var4)]
is significantly different from zero.
Is there any idea how to perform the test?
Thanks in advance,
Ivica
--
Ivica Rubil
Ekonomski institut || The Institute of Economics, Zagreb
Trg J. F. Kennedyja 7, 10 000 Zagreb, Croatia
tel. +385-1-2362-269 || fax. +385-1-2335-165
irubil@eizg.hr || www.eizg.hr
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