Kerstens, Kristiaan; Van de Woestyne, Ignace - In: European Journal of Operational Research 233 (2014) 3, pp. 749-758
We explore the effect of balancing unbalanced panel data when estimating primal productivity indices using non-parametric frontier estimators. First, we list a series of pseudo-solutions aimed at making an unbalanced panel balanced. Then, we discuss some intermediate solutions (e.g., balancing...