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"as described in Westfall & Young's text"
Is this a well-known text?
"I tried increasing the memory allocated to Stata, but that didn't seem to help"
How exactly did you do that? If it was done using -set mem-, it only increases the memory available to the data, which, if I understand correctly, did not increase during your iterations. The unnecessarily increased space for data will decrease the one available for Stata`s computations.
HTH
Martin
-------- Original-Nachricht --------
> Datum: Mon, 28 Dec 2009 10:18:52 -0600
> Von: "Feiveson, Alan H. (JSC-SK311)" <[email protected]>
> An: "[email protected]" <[email protected]>
> Betreff: st: increasing time burden during resampling
> Hi - I am running Stata 11 on Windows XP and I am implementing a form of
> multiple testing using a resampling method as described in Westfall &
> Young's text. Basically, for each iteration the method is:
>
> 1)resample the data modified to a joint null situation (I use the Stata
> -bs- command for this)
> 2) fit a model to the resampled modified data
> 3) do a bunch of tests using -test-
> 4) save the test results.
>
> These operations are identical for each iteration, yet the time per
> iteration increases roughly linearly until it becomes prohibitive to continue.
>
> If I stop after a given number of iterations, I must close out all Stata
> processes before starting again, else the bogged down state still holds.
>
> Previous versions of this that used the estimated coefficients and
> standard errors without -test- didn't seem to have this problem. So I suspect it
> has something to do with repeated use of the -test- command. Maybe something
> needs to be reset or cleared after each iteration?
>
> I tried increasing the memory allocated to Stata, but that didn't seem to
> help. I would appreciate any suggestions for improving efficiency here.
>
>
> Al Feiveson
>
> *
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
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