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Re: st: Using SUR in an unblanaced panel data
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Using SUR in an unblanaced panel data
Date
Wed, 27 Nov 2013 00:21:37 +0000
Please see the FAQ section
http://www.stata.com/support/faqs/resources/statalist-faq/#noanswer
No convenor or committee allocates questions to people or machines
willing to answer. Individuals make their own decisions: simply,
nobody wanted to answer your question as yet.
As you have now posted it three times, you are asked not to post
again. Apart from reminding you of the advice given in the FAQ --
which you were asked to read before posting -- I can only suggest that
multiple questions can seem too much to answer.
Nick
[email protected]
On 27 November 2013 00:12, Abdalla, Ahmed <[email protected]> wrote:
> Dear Statalist
> I have been contacting you more than once for two days but I do not get any response !
>
>
> I have a system of 5 equations and I want to test cross equations restrictions. As far as I understand, I have to use SUR if I seek efficiency and to be able to test the restrictions that involve more than one equation. Stata has the code sureg that tests for SUR in a cross section. In order to test for cross equation restrictions using a panel data set, stata has the code xtsur that is based on an approach originally developed by Brion (2004) for one way random effect estimation of SUR in unbalanced panel set.
>
> My concerns are:
> 1- If I doubt heteroscedasticity which is always the case using financial data, can I use any heteroscedasticity-robust standard errors in STATA and what is the command ?
> 2- Can I cluster standard error by firm or time in stata ? Command?
> 3- xtsur deals with random effect estimation of SUR. What if I test the models using Hausman test and find that the fixed effect model is more appropriate, Can stata deal with this kinds of models using SUR in panel data?
>
> Ahmed
>
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