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st: RE: Bootstrap


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Bootstrap
Date   Thu, 14 Aug 2003 14:51:22 +0100

Joao Pedro W. de Azevedo

> I would like to know how I can save the bootstraped 95%
> confidence intervals
> of a mean.
> It would be best for me to save this either as a scalar or
> a local, since I
> will be using these values to generate a special tabulation
> of several
> variables.
>
> bootstrap "summarize mpg, detail" r(mean), reps(1000)
>
> Bootstrap statistics                              Number of obs    =
> 74
>                                                   Replications     =
> 1000
>
> ------------------------------------------------------------
> ----------------
> --
> Variable     |  Reps  Observed      Bias  Std. Err. [95%
> Conf. Interval]
> -------------+----------------------------------------------
> ----------------
> --
>        _bs_1 |  1000  21.43243 -.0398646  .7065564
> 20.04593   22.81894
> (N)
>              |
> 20.06757    22.7973
> (P)
>              |
> 20.14865   22.85135
> (BC)
> ------------------------------------------------------------
> ----------------
> --
> Note:  N   = normal
>        P   = percentile
>        BC  = bias-corrected

I would guess neither of these. If the output is to
be a table, then it is easiest to store what you want
in variables.

By the way, to bootstrap means, "summarize mpg, meanonly"
is the example to follow. Far less computation.

Nick
n.j.cox@durham.ac.uk

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