본 연구에서는 단위근 검정법 중 ADF (Augmented Dickey-Fuller) 검정법이 널리 사용되고 있음에 따라 단위근 검정을 ADF 검정법에 의하여 실시하였다.
In this study, as the ADF (Augmented Dickey-Fuller) test was widely used among the unit root tests, the unit root test was performed by the ADF test.