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st: R: Difference of means and t-test

From   "Carlo Lazzaro" <>
To   <>
Subject   st: R: Difference of means and t-test
Date   Sun, 13 Jun 2010 08:15:41 +0200

For more details on how to perform a multiple-comparison test with the
apposite corrections, Mmolina may want to take a look at:
- help oneway -

HTH and Kind Regards,
-----Messaggio originale-----
[] Per conto di
Inviato: sabato 12 giugno 2010 23.41
Oggetto: st: Difference of means and t-test

Dear Statalist,

I am working with three different samples.
When I deal with two of them, I can calculate the difference of means and
t-test by doing:

ttesti obs1 mean1 std1 obs2 mean2 std2, unequal

As I have three groups, I am also interested in testing the null: mean1 =
mean2 = mean3 , under the alternative that at least one mean is different.

Could you please give me some advice?

Thanks in advance.

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