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st: a question on t-test

From   "Lili Yan" <>
To   statalist <>
Subject   st: a question on t-test
Date   Fri, 20 Jun 2008 15:57:38 -0500

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!

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