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Figure 1 displays the asymptotic local power functions ofthe following four QML unit root tests: DF, the Dickey–Fuller test; QML-t, based on an iiding the GARCH(1,1) property); QML-G, based on a GaussianGARCH(1,1) likelihood (ignoring the conditionaltion);
Figure 1. Asymptotic local power functions (as function of −c; 5% nominal level) of four unit root tests for low- and high-frequency data.The online version of this figure is in color.
Table 1. Unit root test p-values and estimated parameters for the real exchange rate returns

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