Table 3. The results of Pesaran CADF unit root test .
| Variable | t-bar | cv5 | P | 
| Lpvt | -1.475 | -2.210 | 0.87 | 
| Lpub | -1.959 | -2.210 | 0.16 | 
| Lgdp | -2.532 | -2.210 | 0.00 | 
| Lpopu1 | -0.856 | -2.210 | 1.00 | 
| Lpopu2 | -1.745 | -2.210 | 0.47 | 
| Lurb | -0.252 | -2.210 | 1.00 | 
| Limr | -2.925 | -2.210 | 0.00 | 
| Ledu | -2.125 | -2.210 | 0.04 | 
| Lflab | -1.836 | -2.210 | 0.32 |