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Re: st: Difference of means and t-test


From   Michael McCulloch <mm@pinestreetfoundation.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Difference of means and t-test
Date   Sat, 12 Jun 2010 14:45:19 -0700

One way to do this could be compare 1 to 2, then 2 to 3, then 1 to 3, followed by the Bonferroni adjustment for multiple comparisons.


On Jun 12, 2010, at 2:41 PM, mmolina@uniroma3.it wrote:

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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Best wishes,

Michael McCulloch, LAc MPH PhD
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel:	415-407-1357
fax: 	206-338-2391

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