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I am trying to calculate random and fixed effects models using xtregar
in order to check for heteroskedasticity and autocorrelation. But my panel
data includes 160 countries and only 3 time observations 1970 1980 1990
because they are decade averages to avoid picking up business cycles
dynimics. When I tried to permorm xtregar I got an error r(2000).
Is there a restriction to use xtregar? Should I have to have more
Thanks in advance for your help.
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