Estimating the technical efficiency of health care systems: A cross-country comparison using the directional distance function

Room for improvement in low carbon economies of G7 and BRICS countries based on the analysis of energy efficiency and environmental Kuznets curves

“…More specifically, the DEA-DDF model in F€ are and Grosskopf (2010) and in Cheng and Zervopoulos (2014) refers to the SBM (slackbased measure) model of Tone (2001). Tone's SBM model is further extended to treat undesirable output (Tone, 2004).…”

“…F€ are and Grosskopf (2010) and Cheng and Zervopoulos (2014) indicate a good relationship between the non-radical and radical DEA approaches by using the directional distance function (DDF). More specifically, the DEA-DDF model in F€ are and Grosskopf (2010) and in Cheng and Zervopoulos (2014) refers to the SBM (slackbased measure) model of Tone (2001).…”

The role of environmental variables on the efficiency of water and sewerage companies: a case study of Chile

“…While it is not our intention here to discuss the pros and cons of different approaches to integrating undesirable outputs, it should be noted that in practice, the distance function is applied mostly for handling desirable and undesirable outputs (Cheng and Zervopoulos 2014;Molinos-Senante et al 2014c). Thus, since its introduction, this approach has been used in a wide range of studies covering diverse topics, including health care systems (Cheng and Zervopoulos 2014), banking (Barros et al 2012;Yang 2014), airports (Yu 2010;Lozano et al 2013), and the transport sector (Oum et al 2013;Zhou et al 2014). The reviewed literature demonstrates that the distance function is a well-established method for integrating undesirable outputs into the assessment of efficiency.…”

“…Efficiency models following the production frontier approach and incorporating undesirable outputs can be categorized into six groups (Cheng and Zervopoulos 2014): (i) models based on distance function (Chung et al 1997), (ii) hyperbolic models (Färe et al 1989), (iii) models that introduce undesirable outputs as inputs (Hailu and Veeman 2001), (iv) Seiford and Zhu models (Seiford and Zhu 2002), (v) modifications of the slacks-based measure (Camioto et al 2014), and (vi) models based on the estimation of environmental performance indexes (Zanella et al 2013). While it is not our intention here to discuss the pros and cons of different approaches to integrating undesirable outputs, it should be noted that in practice, the distance function is applied mostly for handling desirable and undesirable outputs (Cheng and Zervopoulos 2014;Molinos-Senante et al 2014c).…”

Performance measurement with multiple interrelated variables and threshold target levels: Evidence from retail firms in the US

“…Step 1 draws on a modified expression of the directional distance function developed by Cheng and Zervopoulos (2014). This step is applied to the units under assessment only for classification reasons, taking into account the scores of all dimensions of performance in the evaluation.…”