Table 2 The results of the test for threshold effects
Threshold effect | F value | P value | Critical value | ||
|---|---|---|---|---|---|
1 % | 5 % | 10 % | |||
Eastern region | |||||
Single threshold | 11.144** | 0.037 | 17.089 | 10.059 | 6.775 |
Double threshold | 16.210* | 0.057 | 44.210 | 18.906 | 12.017 |
Triple threshold | −0.000 | 0.733 | 0.000 | 0.000 | 0.000 |
Central region | |||||
Single threshold | 13.800** | 0.013 | 14.884 | 8.025 | 6.232 |
Double threshold | 57.552*** | 0.000 | 15.150 | 5.075 | 0.752 |
Triple threshold | 0.000 | 0.313 | 0.000 | 0.000 | 0.000 |
Western region | |||||
Single threshold | 21.920* | 0.057 | 30.285 | 23.509 | 18.305 |
Double threshold | 17.856* | 0.073 | 37.893 | 20.581 | 15.877 |
Triple threshold | 0.000 | 0.243 | 0.000 | 0.000 | 0.000 |