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Re: st: Numerous t-tests
That's true. My point was only that the estimated uncertainties from
regress may not match those from ttest when unequal variances are
appropriate. I believe that's true whether you use the robust option for
regresss or not.
----- Original Message -----
From: "Richard Goldstein" <email@example.com>
Sent: Wednesday, October 26, 2005 12:06 PM
Subject: Re: st: Numerous t-tests
while I agree with Michael on this, note that using the robust
option does a great deal to mitigate this
Michael Blasnik wrote:
"Ronán Conroy" <firstname.lastname@example.org> wrote:
-regress- is a lot faster than t-test, and the output is easier to
read, IMO. The coefficient and its confidence interval represent the
difference in means and its CI.
While I agree that regress is faster and often preferred to t-tests, one
should be aware that regress will assume equal variances for the two
groups identified by the dummy variable. That assumption may or may not
be what you want.
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