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st: some questions about xtsur

From   "F. Torracchi" <[email protected]>
To   [email protected]
Subject   st: some questions about xtsur
Date   Mon, 23 Nov 2009 17:23:07 +0100

I am running a SUR on an unbalanced panel dataset. The dependent variables are different production costs for the same product (when added together, they are equal to total production cost). I was wondering whether:
1) STATA provides an intercept for the different equations (that I do not currently obtain)
2) it is possible to correct the standard errors for heteroskedasticity (when adding the option robust, STATA does not produce any different result)
3) the results are a fixed or a random effect model. Reading the original paper by Minh Cong Nguyen it seems that the model is a random effect one, yet I am not completely sure of this. Besides, I run xtsur with both the re and fe options and obtained the same results
4) the issue concerning missing observations (or observations with value very close to zero) has been resolved. The problem is that STATA shows the message "estimates post: matrix has missing values".

I was looking for older posts on all these matters, but I couldn't find any useful information. I would appreciate any clarification.


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