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st: Re: ST: one-tailed test


From   "Eric Uslaner" <euslaner@gvpt.umd.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: ST: one-tailed test
Date   Mon, 11 Oct 2004 08:57:41 -0400

Levy Lee asks how to perform a one-tailed test after a regression and
Richard Williams responds: "ust look at the printout, and see (a) is 
the coefficient for x2 positive, and (b) is it significant at the .10
level  (or double whatever alpha level it is you want to chose).  You
don't need 
to do any additional analyses, the information you need is already
there."

Well, not quite.  Stata (annoyingly) always reports 2-tailed tests,
whereas one-tailed tests are clearly more appropriate.  So you need to
divide the p level by 2.



Ric Uslaner
Department of Government and Politics
University of Maryland
College Park, MD 20742
office phone: 301-405-4151
home phone 301-279-0414
office fax: 301-314-9690
home fax: 301-279-2614
e-mail: euslaner@gvpt.umd.edu
home page: http://www.bsos.umd.edu/gvpt/uslaner
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