st: How can I do for test serial correlation in xtgls and extreg, fe

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

Hy Statalist

I have 13 observation and 15 panels unit. When I run xtgls and
xtreg, fe I have problem becuase the Stata told me that correlation
matrix is singular and It is not possible do the test. How can I do
for test serial correlation in xtgls and extreg; fe?.

My best regards
Rodrigo Lopez

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