**Determination of the number of location parameters**


*Notes: (i) For each model, the optimal number thresholds, denoted r (m), are determined according to a sequential procedure based on the LMF statistics of the hypothesis of non-remaining nonlinearity. (ii) The RSS value is given for each couple (m; r). (iii) The AIC and BIC criterions are shown for each PSTR.*

#### **Table 5.**

*Determination of the number of location parameters for OECD-34.*


#### **Table 6.**

*Results of threshold values of GDP per capita for OECD-34.*


**Table 7.**

#### *PSTR estimates with the real GDP per capita as the threshold*

 *variable: 1997–2015,*

 *OECD-34.* *The Environmental Kuznets Curve: Empirical Evidence from OECD Countries DOI: http://dx.doi.org/10.5772/intechopen.108631*
