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RE: st: one-way 95 CI for Ha: diff < 0


From   "Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: one-way 95 CI for Ha: diff < 0
Date   Mon, 16 Jun 2008 08:44:38 -0700

It's not clear whether you want to get an upper bound or a lower bound
for the difference.  In the intervals given by Maarten and Svend give an
interval that says the difference is at least the lower bound.  But you
may want an interval that says it's no more than the upper bound.  In
particular, if the upper bound is less than 0, then the inference is
that the difference is significantly less than 0.

Tony

Peter A. Lachenbruch
Department of Public Health
Oregon State University
Corvallis, OR 97330
Phone: 541-737-3832
FAX: 541-737-4001

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis
Sent: Saturday, June 14, 2008 2:00 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: one-way 95 CI for Ha: diff < 0 

--- Carlo Lazzaro <carlo.lazzaro@tin.it> wrote:
> after performing the following ttest, I would like to know about a
> possible way to obtain with Stata 9.2/SE the one-way 95 CI for Ha:
> diff < 0.

ttest qaly, by(treat) unequal level(90)

choose the left confidence limit.

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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