Variable | Inspection form | ADF statistics | Critical value | Conclusion | The value of P |

T | (c t 1) | −3.828950 | −3.710482 | First order differential stability | 0.0407 |

| (c t 1) | −4.722667 | −3.690814 | First order differential stability | 0.0075 |

| (c t 2) | −5.225394 | −1−4823.7 | Two order differential stability | 0.0034 |

| (c t 2) | −4.499562 | −3.759743 | Two order differential stability | 0.0147 |

| (c t 1) | −4.901301 | −3.690814 | First order differential stability | 0.0054 |

| (c t 1) | −6.028682 | −3.710482 | First order differential stability | 0.0008 |