# Re: st: Bootstrapping Conf Intervals - what do they mean?

 From Maarten buis To statalist@hsphsun2.harvard.edu Subject Re: st: Bootstrapping Conf Intervals - what do they mean? Date Tue, 3 Jun 2008 20:55:35 +0100 (BST)

```Like any confidence interval it tells you that if you draw a 100
samples from your population and compute a confidence interval in each
sample then you would expect 95 of these intervals to contain the true
population value.

-- Maarten

--- Dan Weitzenfeld <dan.weitzenfeld@emsense.com> wrote:

> Hi Folks,
> I'm grappling with what the results of Bootstrapping can tell you.
> Let's say I bootstrap from my sample 10,000 times, calculating a
> given
> statistic, giving me the detail I need to use the 2.5% and 97.5%
> percentiles to construct a 95% confidence interval.
> What does that *mean*?
> Am I 95% confident that the true value of that statistic is within
> the
> interval?  If so, doesn't that require 100% confidence that my sample
> is an accurate representation of the underlying population?
> Thanks,
> Dan
> *
> *   For searches and help try:
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> *   http://www.stata.com/support/statalist/faq
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>

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

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```