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st: R: Re: R: help: bootstrap with GEE in stata


From   "Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: R: Re: R: help: bootstrap with GEE in stata
Date   Thu, 2 Jul 2009 17:00:56 +0200

Dear Muhammad,
you're absolutely welcome.
However, as Maarten's remarks do seem to point out, the solution to your
problem is probably less trivial than a simple -seed- issue.

All the Best for your research project and Kind Regards,
Carlo

-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Muhammad Riaz
Inviato: giovedì 2 luglio 2009 15.54
A: statalist@hsphsun2.harvard.edu
Oggetto: st: Re: R: help: bootstrap with GEE in stata

Dear Carlo,

good point, yes I have got different results for some of the variables after
(set seed 100000) before running both the commands.

Thank you, 

Muhammad Riaz   


--- On Thu, 7/2/09, Carlo Lazzaro <carlo.lazzaro@tiscalinet.it> wrote:

> From: Carlo Lazzaro <carlo.lazzaro@tiscalinet.it>
> Subject: R: help: bootstrap with GEE in stata
> To: statalist@hsphsun2.harvard.edu
> Cc: citriaz@yahoo.com
> Date: Thursday, July 2, 2009, 5:58 PM
> 
> Dear Muhammad,
> I am not sure that the following hint may be of some help.
> However, did you
> check your bootstrap results setting the same -seed- for
> both of the Stata
> commands that you invoked?
> 
> Kind Regards,
> Carlo
> -----Messaggio originale-----
> Da: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]
> Per conto di citriaz@yahoo.com
> Inviato: giovedì 2 luglio 2009 14.01
> A: statalist@hsphsun2.harvard.edu
> Oggetto: st: help: bootstrap with GEE in stata
> 
> Dear all,
> 
> I am running these two types of commands in stata:
> 
> bootstrap, reps(200): xtgee depvar indvar, fam(normal)
> link(id) i(case_no)
> t(week1_10) robust
> 
> xi: xtgee depvar i.indvar, fam(normal) link(id) i(case_no)
> t(week1_10)
> vce(bootstrap, reps(200))
> 
> The two commands give similar results for some of the
> variables, but for
> some of the variables I get very different results with
> respect to
> significance, for most of the variables I get significant
> results with the
> 1st command given above.
> 
> The dependent variables are of very complex nature and does
> not follow the
> assumption of normality, independent variable is a
> categorical(0,1) 
> 
> I will really appreciate if somebody could add
> comments/suggestions on this
> query.
> 
> 
> Muhammad Riaz  
> 
> 
> Muhammad Riaz   
> 
> 
> 
> 
>       
> 
> 
> 
> *
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> 
> 
> 


      

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