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RE: st: Testing for attrition bias using the BGLW test


From   Julia Vaillant <vaillant@dial.prd.fr>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Testing for attrition bias using the BGLW test
Date   Wed, 25 Aug 2010 12:27:17 +0000

Thank you very much for your answer. I understand this is one way to implement this test, but as I said in the first post this method (regressing the DV on all covariates + attrition dummy + interactions of attrition dummy and covariates) will give the difference between the coefficients of the attritors and non-attritors. 

I am interested in comparing the coefficients of non-attritors with the entire baseline sample (attritors+non-attritors). The goal is to see whether the non-attritors are representative of the full population or not. 

I think this is what Becketti et al. do in their paper where they present the test, but that other papers have used the "interactions" method (I think it's all correct, but it's just not interpreted the same way). 

Thank you, 

Julia


-----Message d'origine-----
De : owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] De la part de Scott Merryman
Envoyé : mercredi 25 août 2010 14:02
À : statalist@hsphsun2.harvard.edu
Objet : Re: st: Testing for attrition bias using the BGLW test

The paper:

http://www.chronicpoverty.org/uploads/publication_files/CPRC%20TOOLKIT%20NOTE%20ON%20ATTRITION-revfinal.pdf

has Stata code on pages 6 and 7 for BGLW test.  Also a do-file is available at:

 http://www.chronicpoverty.org/page/toolbox-analysing-data

Scott


On Wed, Aug 25, 2010 at 4:58 AM, Julia Vaillant <vaillant@dial.prd.fr> wrote:
> Dear Statalist,
>
> I would like to run a BGLW test (Becketti, Gould, Lillard & Welch, 1988, « The Panel study of income dynamics after fourteen years, an evaluation", Journal ef Labor economics, 6:472-92) on my data but I can't figure out how exactly to do it.
>

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