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From | "Martin Weiss" <martin.weiss1@gmx.de> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | AW: st: bootstrap _b VS bootstrap _se |
Date | Wed, 21 Jul 2010 10:22:51 +0200 |
<> " Thanks Marteen again." You may want to double the "a", not the "e"... HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Sirak Gesendet: Mittwoch, 21. Juli 2010 09:57 An: statalist@hsphsun2.harvard.edu Betreff: Re: st: bootstrap _b VS bootstrap _se Thanks Marteen again. But what if the coefficients which I found them significant ( with high t-values) in SUREG are not more significant in bootstrap _b, reps(1000). Isnt it this means the orginal findings dont replicate?? I am asking this because I am estimating costs and I find negative values (negative costs- strange) which are significant in SUREG and are not significant at all in bootstrap _b, reps(1000). Sorry for taking your time. Thanks again. sirak On Wed, Jul 21, 2010 at 9:36 AM, Maarten buis <maartenbuis@yahoo.co.uk> wrote: > --- On Wed, 21/7/10, Sirak wrote: >> But one think I didnt get it here is, the coefficients >> for sureg and bootstrap _b, reps(1000) : sureg are >> the same. the change is only in standard deviation and >> confidence interval. I was expecting to see a little >> change in the coeficients, but none of them changed. >> I have read this suggested that the original findings >> were replicated. Is that right? > > No, that is not correct. The bootstrap is only intended > as a way to calculate standard errors and confidence > intervals. It does not and should not change the point > estimates. The following book is a very readable and > instructive introduction to the bootstrap: > > Bradley Efron and Robert J. Tibshirani (1998) An > Introduction to the Bootstrap. Monographs on Statistics > and Applied Probability, nr 57. Boca Raton: Chapman & > Hall/CRC. > > Hope this helps, > Maarten > > -------------------------- > Maarten L. Buis > Institut fuer Soziologie > Universitaet Tuebingen > Wilhelmstrasse 36 > 72074 Tuebingen > Germany > > http://www.maartenbuis.nl > -------------------------- > > > > > * > * 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/ * * 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/