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st: z statistics in bootstrap output


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: z statistics in bootstrap output
Date   Sat, 6 Sep 2008 18:10:29 +0200

Dear Statalisters,

following some seemingly unfruitful research on Statalist Archives, Stata
9.2/SE manual and Google, I would kindly ask you for a clarification and the
related formula concerning the meaning of z in bootstrap output (please, see
below). 

Thanks a lot for your kindness and for your time.

Kind Regards, 

Carlo
-----------------------------------------------------------------------
Bootstrap results                               Number of obs      =
100
                                                Replications       =
10

      command:  ttest A_C == B_C, unpaired unequal
        _bs_1:  r(mu_1)
        _bs_2:  r(mu_2)

----------------------------------------------------------------------------
--
             |   Observed   Bootstrap                         Normal-based
             |      Coef.   Std. Err.      z    P>|z|     [95% Conf.
Interval]
-------------+--------------------------------------------------------------
--
       _bs_1 |   47.30786   2.200492    21.50   0.000     42.99497
51.62074
       _bs_2 |   76.26435   3.772698    20.21   0.000     68.86999
83.6587
----------------------------------------------------------------------------
--


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