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st: one-way 95 CI for Ha: diff < 0


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: one-way 95 CI for Ha: diff < 0
Date   Sat, 14 Jun 2008 22:38:51 +0200

Dear Statalisters,
after performing the following ttest, I would like to know about a possible
way to obtain with Stata 9.2/SE the one-way 95 CI for Ha: diff < 0.

Thanks a lot for your kindness and for your time.
Kind Regards and enjoy your W-E,
Carlo 



ttest qaly, by(treat) unequal

Two-sample t test with unequal variances
----------------------------------------------------------------------------
Group      Obs        Mean    Std. Err.   Std. Dev.   [95% Conf. Interval]
0	     250       1.1472   .0158906    .2512527     1.115903
1.178497
1          250       1.1872   .0157876     .249624     1.156106    1.218294
----------------------------------------------------------------------------
Combined  500     -.0399999    .0224                  -.0840101    .0040102
----------------------------------------------------------------------------
diff = mean(0) - mean(1)                                      t =  -1.7857
Ho: diff = 0                     Satterthwaite's degrees of freedom =497.979
Ha: diff < 0                 Ha: diff != 0                 Ha: diff > 0
Pr(T < t) = 0.0374         Pr(|T| > |t|) = 0.0748          Pr(T > t) =0.9626




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