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References in periodicals archive ?
- DLPI?: The first Difference of the LPI?, Logarithm of Petrochemical Industry, Index.
The results presented in the above table indicate that based on all the mentioned tests, the null hypothesis considering the existence of unit root in the level series, LBI?, LPI?, BVBI?, BVPI?, LRBI?, and LRPI?, was confirmed, while the IPS test supports the results on the absence of the unit root in the first-order difference series, DLBI?, DLPI?, DBVBI?, DBVPI?, DLRBI?, and DLRPI?.