I tried the levin-lin test. Unfortunately, I get an error message :
. sort id year
. tsset id year
panel variable: id (strongly balanced)
time variable: year, 2004 to 2005
. levinlin csp, lags(1)
Levin-Lin-Chu test for csp Deterministics chosen: constant
Reducing Andrews truncation
no observations
r(2000);
. describe csp
storage display value
variable name type format label variable label
-------------------------------------------------------------------------------
csp float %9.0g CSP
Do you have any idea what the problem could be?
Claude
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