Re: st: dropped observations in bootstrap

[Michael McCulloch <mm@pinest.org>]

Brilliant! It makes perfect sense, that when the bootstrap is 
re-sampling it's attempting to generate variables that already exist. 
Thank you so much.


> --- Maarten wrote:
> >  > One step you can take is to call the program -msm- you created,
> >  > outside -bootstrap- and see if it works, you can call it a second
> >  > time and you will see that it no longer works because several
> >  > variables are-generate-ed which already exist (where created during
> >  > the first call to -msm-). How did I know to call -msm- twice? I
> >  > made the same mistake you made many many times...
> --- Michael McCulloch <mm@pinest.org> wrote:
> >  My temporary elation is tempered by the nagging discomfort of not
> >  knowing why the use of temporary variables resolved the issue. I'll
> >  proceed with your suggested -trace- approach. Many thanks, Michael
> So, your program needs to create a number of variables. It leaves those
> variables behind after it has finished. With -bootstrap- you run your
> program multiple times (as many as you specify in the -reps()-
> options).  So now when you try to run the program multiple times, -msm-
> tries to -generate- variables that already exist (were made by the
> previous call to -msm-). This causes errors, as a result it returns no
> results to -bootstrap- causing to display red X instead green dots.
>
> Hope this helps,
> Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
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> The Netherlands
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> http://home.fsw.vu.nl/m.buis/
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