| Phillip-Perron Test Statistics | |||||
| variables | Level/Δ Level | Bandwidth** | Adj. t-statistic | Prob* | Inference |
| Log GDP | Level | 1 | −0.456 | 0.888 | Non-stationary |
| Δ Level | 3 | −5.136 | 0.000 | stationary | |
| log FDI | Level | 3 | 0.067 | 0.9586 | Non-stationary |
| Δ Level | 1 | −8.829 | 0.000 | stationary | |