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From |
"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: increasing time burden during resampling |

Date |
Mon, 28 Dec 2009 10:55:08 -0600 |

Martin - I used "/m170" in the properties of the Stata 11 shortcut. Are you suggesting I make this smaller instead of larger, to make more room for computations? But why do the same computations take more and more memory? Something must be generated by -test- that clogs up the memory and doesn't get cleared. Westfall, P. H. and Young, S. S, 1993. Resampling-Based Multiple Testing. New York: John Wiley & Sons, Inc Al -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss Sent: Monday, December 28, 2009 10:32 AM To: statalist@hsphsun2.harvard.edu Subject: Re: st: increasing time burden during resampling <> "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)" <alan.h.feiveson@nasa.gov> > An: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> > 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 > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: RE: st: increasing time burden during resampling***From:*"Martin Weiss" <Martin.Weiss1@gmx.de>

**References**:**st: increasing time burden during resampling***From:*"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>

**Re: st: increasing time burden during resampling***From:*"Martin Weiss" <Martin.Weiss1@gmx.de>

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