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Re: st: GMM diff vs sys


From   <[email protected]>
To   <[email protected]>
Subject   Re: st: GMM diff vs sys
Date   Thu, 9 Feb 2006 07:57:31 -0300 (ART)

I`ve tried this

xtlsdvc depvar varlist

But It hasn`t funtioned Could you tell me what it`s wrong?

Thanks a lot


> Hi,
>
> There is a recent paper by Bun and Kiviet "The Effects of Dynamic
> Feedbacks  on LS and MM Estimator Accuracy in Panel Data Models",
> forthcoming in  Journal of Econometrics. This one explains that there
> are cases where the  difference GMM can do better than the system GMM.
>
> However, with only 20 countries it is very unlikely to get sensible
> results  regardless of the GMM estimator you use. This is because the
> virtue of  using GMM is in large samples. You may be better off by using
> the xtlsdvc  command which refers to Kiviets bias corrected estimator.
>
> Best
>
> Vasilis
>
>
> On Feb 7 2006, [email protected] wrote:
>
>>Dears,
>>I have a panel dataset for a sample of 20 countries over 8 periods I`ve
>> use GMM method to estimate a model of convergence like this
>>yit=b yit-1 + q xit + uit
>>where xit are exogenous variables
>>I could be posible that difference GMM work better than sysyem GMM?
>> Thanks
>>
>>
>>
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>
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