In this paper, we propose a panel data semiparametric varying-coefficient model in which covariates (variables affecting the coefficients) are purely categorical. This model has two features: first, fixed effects are included to allow for correlation between individual unobserved heterogeneity...

Using the standard Ricardian model, we developed the numerical result of Samuelson (2004) with general conditions. Specifically, our analysis shows that, the cumulative technological progress of the South will undermine the welfare of the North even before the relative productivities of the two...

In this paper, we propose a variable selection procedure based on the shrinkage estimation technique for a categorical varying-coefficient model. We apply the method to identify the relevant determinants for body mass index (BMI) from a large amount of potential factors proposed in the...

Although peroxymonosulfate (PMS) coupling with ultrasonic piezo-catalysis (PE) or electrolysis (E) exhibited synergy of organics degradation by generating more reactive oxidative species (ROS), the relatively high energy consumption restricted their application. Hydro-energy, as a clean energy...