Thank you (Dr) Martin
I think that was the problem. I had totally missed the -ivprobit- syntax
Regards
Sachin
PS: Considering you may be a Doctoral Candidate I included the
brackets around the Dr.
On Tue, Apr 21, 2009 at 11:08 AM, Sachin Chintawar
<[email protected]> wrote:
> Dear Statalist Users
> Well adding to my earlier program I did find a few silly mistakes that
> I have cleaned up. Find a newer version of the program with more
> doubts.
> --------------------------------------------------Start
> Example---------------------------------------------------------------------
> global numobs 500 // sample size N
> global numsims "1000" // number of simulations
> set seed 123456789
>
> capture program drop endoprob
>
> program endoprob, rclass
> version 10.1
> drop _all
> set obs $numobs
> generate u = rnormal(0)
> generate mu = rnormal(0)
> generate x1 = rnormal(0)
> generate z1 = rnormal(0) // 4 Instruements
> generate z2 = rnormal(0)
> generate z3 = rnormal(0)
> generate z4 = rnormal(0)
> // Also be written *drawnorm u mu x1 z1 z2 z3 z4
> generate a = 0.5*u
> generate x2 = z1 + z2 + z3 + z4 + a
> regress x2 z1 z2 z3 z4 mu // endogenous regressor
> with four instruments
> predict px2
>
> generate y = 0.5 + 2*x1 + px2 + mu + u>4 //Reduced Form Equation
> ivprobit y x1 px2
> return scalar b2 = _b[x1]
> return scalar b3 = _b[px2]
> return scalar se2 = _se[x1]
> return scalar se3 = _b[px2]
> end
> simulate b2=r(b2) b3=r(b3) se2r=r(se2) se3r=r(se3), ///
> reps($numsims): endoprob
> mean b2 b3 se2r se3r
> -------------------------------------------End
> Example---------------------------------------------------------------------------------
> 1. Adding to my earlier problem if we run this program an error occurs
> suggesting that there is no endogenous variable and that I use
> -probit- . But this totally negates the question I want to answer -
> the Amount of bias as we increase the number of instruments?
> Any suggestions would be appreciated
>
>
> I
>
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