Recently, a relatively new methodology named directional distance function (DDF) has been
attracting positive attention in the field of energy and environmental (E&E) modeling …

This paper analyses the change in environmental performance that took place in the
transport industry of 38 countries between the years 1995 and 2009. Data Envelopment …

This study examines the technical efficiency and environmental efficiency of bus transit firms
using the slack-based measures (SBM) and non-separable slack-based measures (NSSBM) …

Improvement of operational efficiency is a common goal of most governmental freight
transport policies. Productivity and efficiency analysis consequently provides a sound …

This study reviews productivity growth in the five major transportation industries in the United
States (airline, truck, rail, pipeline, and water) and the pooled transportation industry from …

This study presents a two-stage network performance evaluation model that determines the
efficiency and effectiveness of bus transit systems. The model accounts for non-storable …

This research includes the analysis and comparison of long-term values of key business
parameters of profit-oriented companies in Serbia, which are engaged in road transport of …

A variety of research fields has analyzed actual productivity change from environmental
pollution through the Malmquist environmental productivity index, but to our best knowledge …

Two features in time series data: the existence of time trends and the degree of persistence,
are examined in this work on the nitrogen oxides emissions from 37 OECD countries …

Air pollution worsens work environment and increases the likelihood of health risks and
even premature death for humans. Owing to the fundamental structure of growth through the …