st: serial correlation in panel data

[Rodrigo L�pez <rodrilopez88@hotmail.com>]

Hi Statalist

I am phd student. I was running a xtgls estimation in Stata 7. After this I 
tried to test the Breusch-Pagan Statistic for cross-section independence in 
the residuals. I had a proble with that becuase my screen show me 
"correlation matrix of residuals is singular not possible with test. Thanks 
for help.

Rodrigo L�pez

_________________________________________________________________
MSN Compras: Veinte tiendas personales abiertas todo el d�a.  
http://www.msn.es/compras/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/