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Re: st: puzzling sqreg behavior, possible solution


From   "Dimitriy V. Masterov" <dvmaster@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: puzzling sqreg behavior, possible solution
Date   Fri, 19 Oct 2007 19:09:54 -0400

Thanks to Austin Nichols for the solution. Using the stable option
with sort does the trick. In my code, above the sqreg, I actually had

bysort treat: sum x*;

If one were to rewrite this as

sort treat, stable;
by treat: sum x*;

the bootstrapped errors would be identical each time you ran the do-file.

DVM

On 10/19/07, Austin Nichols <austinnichols@gmail.com> wrote:
> Dimitriy V. Masterov <dvmaster@umich.edu>:
> -sort- has a -stable- option; see -help sort-
> and set the seed before sorting
>
> On 10/19/07, Dimitriy V. Masterov <dvmaster@umich.edu> wrote:
> > When you sort by a variable with ties, the random number generation is
> > changed, which changes the bootstrapped standard errors each time you
> > run the do-file.
> >
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