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Re: st: bootstrap two-stage logit


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: bootstrap two-stage logit
Date   Wed, 11 May 2011 12:08:00 -0400

Why are you worried about estimating SEs for an inconsistent estimator?
Do you have a ref that advocates your "two-stage IV logit estimation"
(see comments on Grogger by googling "grogger gmm logit iv")?

On Wed, May 11, 2011 at 10:41 AM, xueliansharon <xuelianstata@gmail.com> wrote:
> Hi,
>
> I want to estimate a logit model with one continuous endogenous explanatory
> variable (educ), I have two instruments (moth and fath) in hand to address
> the endogeneity, so I would like to use two-stage IV logit estimation. I
> want to use bootstrap to return the point estimates of the two-stage logit
> model and their bootstrap standard errors.
>
> The following are my codes, but the returned bootstrapped standard errors
> are the same to the SEs of second-stage logit model (which is wrong and
> needs to corrected by bootstrap), i.e. the bootstrap didn't make any
> difference in correcting the SEs of second-stage logit model. Can anyone
> help me to figure out the mistake in the program? Many thanks!!!
>
>
> use http://fmwww.bc.edu/ec-p/data/wooldridge/mroz.dta, clear
> capture program drop myprog
> prog myprog, eclass
>  regress educ age kidslt6 kidsge6 city moth fath
>  capture drop peduc
>  predict peduc,xb
>  logit inlf peduc age kidslt6 kidsge6 city
>        tempvar touse
>        tempname b V
>        matrix `b'=e(b)
>        matrix `V'=e(V)
>
>        quietly gen byte `touse' = e(sample)
>        ereturn post `b' `V', esample(`touse')
>        ereturn local cmd "myprog"
> end
> bootstrap, reps(20) seed(1014): myprog
>
> Regards,
> Sharon

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