Re: st: Recovering Jacobian from gmm estimate

[Nick Cox <njcoxstata@gmail.com>]

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Nick
njcoxstata@gmail.com


On 4 October 2013 16:52, Tony Stata <tony.stata@gmail.com> wrote:
> Hello everyone,
>
> To calculate the asymptotic variance of the gmm estimate, Stata
> numerically calculates the Jacobian matrix (unless the analytic
> derivatives are supplied manually). What is the best way to recover
> this matrix and store it locally?
>
> A few comments:
>
> (i) For reference, I'm referring to the G_bar(Beta_hat) matrix in
> equation 5 in the gmm section of the Stata Reference Manual (Release
> 12)
>
> (ii) It would be possible to numerically calculate the Jacobian after
> estimation, but that could be computationally costly, and Stata has
> already done that computation, so it would be nice to avoid that
> redundancy
>
> (iii) From what I can tell, all the other matrices in the asymptotic
> variance calculation are being saved in e() by gmm: e(W) is the weight
> matrix, e(S) is the moment var-cov matrix, and e(V) is the parameter
> var-cov matrix, but I can't find the Jacobian
>
> Thanks!
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