Hansen test to examine whether the estimation encounters an overidentification problem;<br><br>the AR (2) test to examine the problem of autocorrelation in the estimation;<br><br>the difference-in-Hansen test to examine whether the instruments used for the equations in levels are exogenous.<br><br>null hypothesis that the over-identifying restrictions are valid<br><br>Roodman, we used the second lag of governanceas its instrument.
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