The first model to be estimated is a pooled OLS model, which implies that no fixed or random effects are present
in the panel data and that intercept and slopes of the explanatory variables do not vary with time and space. The
results obtained show that the pooled OLS model accounts for about 72% of the variance of GDP per capita.
However, a panel model is favored as an F test on the coefficients shows that there is not enough evidence to accept
the stability of the pooled OLS model (F statistics =8.4356, p-value=0.000). Thus, it appears that the growth poles
are heterogeneous in terms of economic development driven by human capital determinants.