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Re: st: a question on t-test
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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