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 problem with that becuase my screen show me 
"correlation matrix of residuals is singular not possible with test. Thanks 
for help.

Rodrigo L�pez

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