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Re: st: a question on t-test


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu, statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: a question on t-test
Date   Fri, 20 Jun 2008 17:24:54 -0400

I'm probably missing something, but wouldn't it be a lot more straightforward just to use the ttest command, e.g.

ttest mpg, by(foreign)

At 04:57 PM 6/20/2008, Lili Yan wrote:

Hi there,

I need calculate the mean of two groups (say, native cars and foreign
cars) and do a t-test. However, I am not very sure if -lincom- is the
correct command after -mean-. Could anyone please let me know if the
following commands are right?

mean mpg, over(foreign)
lincom [`var']0-[`var']1
di 2*ttail(r(df), abs(r(estimate)/r(se)))

Thanks in advance!

Best,
Lili
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Richard Williams, Notre Dame Dept of Sociology
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