Tsionas, Efthymios G.; Kumbhakar, Subal C. - In: Journal of Applied Econometrics 29 (2014) 1, pp. 110-132
SUMMARY This paper considers a panel data stochastic frontier model that disentangles unobserved firm effects (firm heterogeneity) from persistent (time‐invariant/long‐term) and transient (time‐varying/short‐term) technical inefficiency. The model gives us a four‐way error component...