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Central limit theorems for conditional efficiency measures and tests of the ‘separability’ condition in non‐parametric, two‐stage models of production
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- Caitlin O’Loughlin & Léopold Simar & Paul W. Wilson, 2023.
"Methodologies for assessing government efficiency,"
Chapters, in: António Afonso & João Tovar Jalles & Ana Venâncio (ed.), Handbook on Public Sector Efficiency, chapter 4, pages 72-101,
Edward Elgar Publishing.
- O’Loughlin, Caitlin & Simar, Léopold & Wilson, Paul, 2021. "Methodologies for assessing government efficiency," LIDAM Discussion Papers ISBA 2021002, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- O’Loughlin, Caitlin & Simar, Léopold & Wilson, Paul W., 2023. "Methodologies for assessing government efficiency," LIDAM Reprints ISBA 2023009, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Frédérique Fève & Jean-Pierre Florens & Léopold Simar, 2023.
"Proportional incremental cost probability functions and their frontiers,"
Empirical Economics, Springer, vol. 64(6), pages 2721-2756, June.
- Fève, Frédérique & Florens, Jean-Pierre & Simar, Léopold, 2022. "Proportional Incremental Cost Probability Functions and their Frontiers," LIDAM Discussion Papers ISBA 2022016, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Fève, Frédérique & Florens, Jean-Pierre & Simar, Léopold, 2023. "Proportional incremental cost probability functions and their frontiers," LIDAM Reprints ISBA 2023011, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Kounetas, Konstantinos & Polemis, Michael & Tzeremes, Nickolaos, 2019. "An alternative probabilistic frontier analysis to the measurement of eco-efficiency," MPRA Paper 93686, University Library of Munich, Germany.
- Geraldo Souza & Eliane Gonçalves Gomes & Eliseu Roberto Alves, 2022. "Two-part fractional regression model with conditional FDH responses: an application to Brazilian agriculture," Annals of Operations Research, Springer, vol. 314(2), pages 393-409, July.
- Calogero Guccio & Marco Ferdinando Martorana & Isidoro Mazza & Giacomo Pignataro & Ilde Rizzo, 2022.
"Is innovation in ICT valuable for the efficiency of Italian museums?,"
European Planning Studies, Taylor & Francis Journals, vol. 30(9), pages 1695-1716, September.
- Calogero Guccio & Marco Ferdinando Martorana & Isidoro Mazza & Giacomo Pignataro & Ilde Rizzo, 2020. "Is innovation in ICT valuable for the efficiency of Italian museums?," Working papers 95, Società Italiana di Economia Pubblica.
- Calogero Guccio & Marco Ferdinando Martorana & Isidoro Mazza & Giacomo Pignataro & Ilde Rizzo, 2020. "Is innovation in ICT valuable for the efficiency of Italian museums?," ACEI Working Paper Series AWP-01-2020, Association for Cultural Economics International, revised Dec 2020.
- Bădin, Luiza & Daraio, Cinzia & Simar, Léopold, 2019.
"A bootstrap approach for bandwidth selection in estimating conditional efficiency measures,"
European Journal of Operational Research, Elsevier, vol. 277(2), pages 784-797.
- Luiza Badin & Cinzia Daraio & Léopold Simar, 2018. "A Bootstrap Approach for Bandwidth Selection in Estimating Conditional Efficiency Measures," DIAG Technical Reports 2018-02, Department of Computer, Control and Management Engineering, Universita' degli Studi di Roma "La Sapienza".
- Badin, Luiza & Daraio, Cinzia & Simar, Leopold, 2019. "A Bootstrap Approach for Bandwidth Selection in Estimating Conditional Efficiency Measures," LIDAM Reprints ISBA 2019013, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Badin, Luiza & Daraio, Cinzia & Simar, Leopold, 2018. "A Bootstrap Approach for Bandwidth Selection in Estimating Conditional Efficiency Measures," LIDAM Discussion Papers ISBA 2018007, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Ioannis E. Tsolas, 2021. "Efficiency and Determinants of Capital Structure in the Greek Pharmaceutical, Cosmetic and Detergent Industries," JRFM, MDPI, vol. 14(12), pages 1-13, December.
- Jose M. Cordero & Cristina Polo & Daniel Santín, 2020. "Assessment of new methods for incorporating contextual variables into efficiency measures: a Monte Carlo simulation," Operational Research, Springer, vol. 20(4), pages 2245-2265, December.
- Francisco Javier Sáez-Fernández & Ignacio Jiménez-Hernández & María del Sol Ostos-Rey, 2020. "Seasonality and Efficiency of the Hotel Industry in the Balearic Islands: Implications for Economic and Environmental Sustainability," Sustainability, MDPI, vol. 12(9), pages 1-17, April.
- Caitlin T. O’Loughlin & Paul W. Wilson, 2021. "Benchmarking the performance of US Municipalities," Empirical Economics, Springer, vol. 60(6), pages 2665-2700, June.
- Simar, Léopold & Zelenyuk, Valentin & Zhao, Shirong, 2024. "Inference for aggregate efficiency: Theory and guidelines for practitioners," LIDAM Reprints ISBA 2024012, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Sergio Destefanis & Francesco Addesa & Giambattista Rossi, 2022. "The impact of COVID-19 on home advantage: a conditional order-m analysis of football clubs’ efficiency in the top-5 European leagues," Applied Economics, Taylor & Francis Journals, vol. 54(58), pages 6639-6655, December.
- Benito, Bernardino & Guillamón, María-Dolores & Martínez-Córdoba, Pedro-José, 2020. "Determinants of efficiency improvement in the Spanish public lighting sector," Utilities Policy, Elsevier, vol. 64(C).
- Anders Rønn-Nielsen & Dorte Kronborg & Mette Asmild, 2019. "Exact tests on returns to scale and comparisons of production frontiers in nonparametric models," IFRO Working Paper 2019/04, University of Copenhagen, Department of Food and Resource Economics.
- Heidenreich, Anja & Grovermann, Christian & Kadzere, Irene & Egyir, Irene S. & Muriuki, Anne & Bandanaa, Joseph & Clottey, Joseph & Ndungu, John & Blockeel, Johan & Muller, Adrian & Stolze, Matthias &, 2022. "Sustainable intensification pathways in Sub-Saharan Africa: Assessing eco-efficiency of smallholder perennial cash crop production," Agricultural Systems, Elsevier, vol. 195(C).
- Fukuyama, Hirofumi & Matousek, Roman & Tzeremes, Nickolaos G., 2023. "Estimating the degree of firms’ input market power via data envelopment analysis: Evidence from the global biotechnology and pharmaceutical industry," European Journal of Operational Research, Elsevier, vol. 305(2), pages 946-960.
- Cinzia Daraio & Leopold Simar & Paul W. Wilson, 2019.
"Quality and its Impact on Efficiency,"
LEM Papers Series
2019/06, Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
- Daraio, Cinzia & Simar, Leopold & Wilson, Paul, 2019. "Quality and its impact on efficiency," LIDAM Discussion Papers ISBA 2019004, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Cinzia Daraio & Léopold Simar & Paul W. Wilson, 2019. "Quality and its Impact on Efficiency," DIAG Technical Reports 2019-01, Department of Computer, Control and Management Engineering, Universita' degli Studi di Roma "La Sapienza".
- S. C. West & A. W. Mugera & R. S. Kingwell, 2022. "The choice of efficiency benchmarking metric in evaluating firm productivity and viability," Journal of Productivity Analysis, Springer, vol. 57(2), pages 193-211, April.
- Mastromarco, Camilla & Simar, Léopold & Van Keilegom, Ingrid, 2022. "Estimating Nonparametric Conditional Frontiers and Efficiencies: A New Approach," LIDAM Discussion Papers ISBA 2022035, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Mariarosaria Agostino & Emanuele Brancati & Anna Giunta & Domenico Scalera & Francesco Trivieri, 2020. "Firms' efficiency and global value chains: An empirical investigation on Italian industry," The World Economy, Wiley Blackwell, vol. 43(4), pages 1000-1033, April.
- Léopold Simar & Paul W. Wilson, 2020.
"Hypothesis testing in nonparametric models of production using multiple sample splits,"
Journal of Productivity Analysis, Springer, vol. 53(3), pages 287-303, June.
- Simar, Leopold & Wilson, Paul, 2019. "Hypothesis Testing in Nonparametric Models of Production using Multiple Sample Splits," LIDAM Discussion Papers ISBA 2019019, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Simar, Leopold & Wilson, Paul, 2020. "Hypothesis Testing in Nonparametric Models of Production using Multiple Sample Splits," LIDAM Reprints ISBA 2020004, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Nguyen, Bao Hoang & Simar, Léopold & Zelenyuk, Valentin, 2021.
"Data sharpening for improving CLT approximations for DEA-type efficiency estimators,"
LIDAM Discussion Papers ISBA
2021033, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Bao Hoang Nguyen & Léopold Simar & Valentin Zelenyuk, 2021. "Data Sharpening for improving CLT approximations for DEA-type efficiency estimators," CEPA Working Papers Series WP142021, School of Economics, University of Queensland, Australia.
- Cinzia Daraio & Léopold Simar & Paul W. Wilson, 2020.
"Fast and efficient computation of directional distance estimators,"
Annals of Operations Research, Springer, vol. 288(2), pages 805-835, May.
- Cinzia Daraio & Léopold Simar & Paul W. Wilson, 2018. "Fast and Efficient Computation of Directional Distance Estimators," DIAG Technical Reports 2018-05, Department of Computer, Control and Management Engineering, Universita' degli Studi di Roma "La Sapienza".
- Daraio, Cinzia & Simar, Leopold & Wilson, Paul W., 2019. "Fast and efficient computation of directional distance estimators," LIDAM Reprints ISBA 2019022, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Daraio, Cinzia & Simar, Leopold & Wilson, Paul, 2018. "Fast and Efficient Computation of Directional Distance Estimators," LIDAM Discussion Papers ISBA 2018017, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Cinzia Daraio & Leopold Simar & Paul W. Wilson, 2018. "Fast and Efficient Computation of Directional Distance Estimators," LEM Papers Series 2018/21, Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
- Lisciandra, Maurizio & Milani, Riccardo & Millemaci, Emanuele, 2022. "A corruption risk indicator for public procurement," European Journal of Political Economy, Elsevier, vol. 73(C).
- De la Cruz, Marco & Mergoni, Anna, 2024. "Assessing the performance of Peruvian education system from a governance perspective," Socio-Economic Planning Sciences, Elsevier, vol. 93(C).
- Ye Wang & Yunguo Lu & Lin Zhang, 2021. "Opportunity Cost of Environmental Regulation in China’s Industrial Sector," IJERPH, MDPI, vol. 18(16), pages 1-19, August.
- Simar, Léopold & W. Wilson, Paul, 2019.
"Central limit theorems and inference for sources of productivity change measured by nonparametric Malmquist indices,"
European Journal of Operational Research, Elsevier, vol. 277(2), pages 756-769.
- Simar, Leopold & Wilson, Paul, 2018. "Central Limit Theorems and Inference for Sources of Productivity Change Measured by Nonparametric Malmquist Indices," LIDAM Discussion Papers ISBA 2018021, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Simar, Leopold & W. Wilson, Paul, 2019. "Central limit theorems and inference for sources of productivity change measured by nonparametric Malmquist indices," LIDAM Reprints ISBA 2019010, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Nguyen, Bao Hoang & Simar, Léopold & Zelenyuk, Valentin, 2022.
"Data sharpening for improving central limit theorem approximations for data envelopment analysis–type efficiency estimators,"
European Journal of Operational Research, Elsevier, vol. 303(3), pages 1469-1480.
- Nguyen, Bao Hoang & Simar, Léopold & Zelenyuk, Valentin, 2022. "Data sharpening for improving central limit theorem approximations for data envelopment analysis-type efficiency estimators," LIDAM Reprints ISBA 2022039, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Simar, Léopold & Wilson, Paul, 2022. "Modern Tools for Evaluating the Performance of Health-Care Providers," LIDAM Discussion Papers ISBA 2022006, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Ioannis E. Tsolas, 2020. "Financial Performance Assessment of Construction Firms by Means of RAM-Based Composite Indicators," Mathematics, MDPI, vol. 8(8), pages 1-16, August.
- Pierluigi Toma, 2020. "Size and productivity: a conditional approach for Italian pharmaceutical sector," Journal of Productivity Analysis, Springer, vol. 54(1), pages 1-12, August.
- Simar, Léopold & Zelenyuk, Valentin & Zhao, Shirong, 2024.
"Inference for aggregate efficiency: Theory and guidelines for practitioners,"
European Journal of Operational Research, Elsevier, vol. 316(1), pages 240-254.
- Léopold Simar & Valentin Zelenyuk & Shirong Zhao, 2023. "Inference for Aggregate Efficiency: Theory and Guidelines for Practitioners," CEPA Working Papers Series WP032023, School of Economics, University of Queensland, Australia.
- Simar, Léopold & Zelenyuk, Valentin & Zhao, Shirong, 2023. "Inference for Aggregate Efficiency: Theory and Guidelines for Practitioners," LIDAM Discussion Papers ISBA 2023016, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Benito, Bernardino & Martínez-Córdoba, Pedro-José & Guillamón, María-Dolores, 2021. "Measurement and determinants of efficiency in the municipal police service," Evaluation and Program Planning, Elsevier, vol. 85(C).
- Polemis, Michael L. & Stengos, Thanasis & Tzeremes, Nickolaos G., 2020. "Advertising expenses and operational performance: Evidence from the global hotel industry," Economics Letters, Elsevier, vol. 192(C).
- Vesterberg, Mattias & Zhou, Wenchao & Lundgren, Tommy, 2021. "Wind of change: Small-scale electricity production and distribution-grid efficiency in Sweden," Utilities Policy, Elsevier, vol. 69(C).
- López-Torres, Laura & Johnes, Jill & Elliott, Caroline & Polo, Cristina, 2021. "The effects of competition and collaboration on efficiency in the UK independent school sector," Economic Modelling, Elsevier, vol. 96(C), pages 40-53.
- Capasso, Salvatore & Kaisari, Maria & Kounetas, Konstantinos & Lainas, Elias, 2024.
"School productive performance and technology gaps: New evidence from PISA 2018,"
Economic Modelling, Elsevier, vol. 131(C).
- Capasso Salvatore & Maria Kaisari & Konstantinos Kounetas & Elias Lainas, 2023. "School productive performance and technology gaps: new evidence from PISA 2018," CSEF Working Papers 696, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy.
- Guangshun Qiao & Zhan-ao Wang, 2021. "Vertical integration vs. specialization: a nonparametric conditional efficiency estimate for the global semiconductor industry," Journal of Productivity Analysis, Springer, vol. 56(2), pages 139-150, December.
- Zhu, Liyun & Schneider, Kevin & Oude Lansink, Alfons, 2023. "Economic, environmental, and social inefficiency assessment of Dutch dairy farms based on the dynamic by-production model," European Journal of Operational Research, Elsevier, vol. 311(3), pages 1134-1145.
- Daraio, Cinzia & Simar, Léopold, 2022.
"Approximations and Inference for Nonparametric Production Frontiers,"
LIDAM Discussion Papers ISBA
2022017, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Cinzia Daraio & Leopold Simar, 2022. "Approximations and Inference for Nonparametric Production Frontiers," LEM Papers Series 2022/14, Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
- Hongwei Liu & Chenchen Gao & Henry Tsai, 2024. "Spatial spillover and determinants of tourism efficiency: A low carbon emission perspective," Tourism Economics, , vol. 30(3), pages 543-566, May.
- Enrique J. Buch‐Gómez & Roberto Cabaleiro‐Casal, 2020. "Turnout, political strength, and cost efficiency in Spanish municipalities of the autonomous region of Galicia: Evidence from an alternative stochastic frontier approach," Papers in Regional Science, Wiley Blackwell, vol. 99(3), pages 533-553, June.
- Engida, Tadesse Getacher & Rao, Xudong & Oude Lansink, Alfons G.J.M., 2020. "A dynamic by-production framework for analyzing inefficiency associated with corporate social responsibility," European Journal of Operational Research, Elsevier, vol. 287(3), pages 1170-1179.
- Pedro-José Martínez-Córdoba & Nicola Raimo & Filippo Vitolla & Bernardino Benito, 2020. "Achieving Sustainable Development Goals. Efficiency in the Spanish Clean Water and Sanitation Sector," Sustainability, MDPI, vol. 12(7), pages 1-13, April.
- Mohamed Mehdi Jelassi & Ezzeddine Delhoumi, 2021. "What explains the technical efficiency of banks in Tunisia? Evidence from a two-stage data envelopment analysis," Financial Innovation, Springer;Southwestern University of Finance and Economics, vol. 7(1), pages 1-26, December.
- Agasisti, Tommaso & Zoido, Pablo, 2019. "The efficiency of schools in developing countries, analysed through PISA 2012 data," Socio-Economic Planning Sciences, Elsevier, vol. 68(C).
- Zelenyuk, Valentin, 2020. "Aggregation of inputs and outputs prior to Data Envelopment Analysis under big data," European Journal of Operational Research, Elsevier, vol. 282(1), pages 172-187.
- Bulut, Hasan, 2020. "The construction of a composite index for general satisfaction in Turkey and the investigation of its determinants," Socio-Economic Planning Sciences, Elsevier, vol. 71(C).
- Falavigna, G. & Ippoliti, R., 2020. "The socio-economic planning of a community nurses programme in mountain areas: A Directional Distance Function approach," Socio-Economic Planning Sciences, Elsevier, vol. 71(C).
- Nickolaos G. Tzeremes, 2019. "Technological change, technological catch-up and export orientation: evidence from Latin American Countries," Journal of Productivity Analysis, Springer, vol. 52(1), pages 85-100, December.
- Faten Ben Bouheni & Hassan Obeid & Elena Margarint, 2022. "Nonperforming loan of European Islamic banks over the economic cycle," Annals of Operations Research, Springer, vol. 313(2), pages 773-808, June.
- Amir Moradi-Motlagh & Ali Emrouznejad, 2022. "The origins and development of statistical approaches in non-parametric frontier models: a survey of the first two decades of scholarly literature (1998–2020)," Annals of Operations Research, Springer, vol. 318(1), pages 713-741, November.
- Karagiannis, Roxani & Karagiannis, Giannis, 2023. "Nonparametric estimates of price efficiency for the Greek infant milk market: Curing the curse of dimensionality with shannon entropy," Economic Modelling, Elsevier, vol. 121(C).
- Andrea Bonfiglio & Roberto Henke & Fabio Pierangeli & Maria Rosaria Pupo D'Andrea, 2020. "Effects of redistributing policy support on farmers’ technical efficiency," Agricultural Economics, International Association of Agricultural Economists, vol. 51(2), pages 305-320, March.
- Nicola Galluzzo, 2021. "Estimation of the impact of CAP subsidies as environmental variables on Romanian farms," Economia agro-alimentare, FrancoAngeli Editore, vol. 23(3), pages 1-24.
- Del Barrio-Tellado, María José & Gómez-Vega, Mafalda & Gómez-Zapata, Jonathan Daniel & Herrero-Prieto, Luis César, 2021. "Urban public libraries: Performance analysis using dynamic-network-DEA," Socio-Economic Planning Sciences, Elsevier, vol. 74(C).
- Léopold Simar & Paul W. Wilson, 2023.
"Another look at productivity growth in industrialized countries,"
Journal of Productivity Analysis, Springer, vol. 60(3), pages 257-272, December.
- Simar, Léopold & Wilson, Paul, 2022. "Another Look at Productivity Growth in Industrialized Countries," LIDAM Discussion Papers ISBA 2022028, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Christopher F. Parmeter & Valentin Zelenyuk, 2019. "Combining the Virtues of Stochastic Frontier and Data Envelopment Analysis," Operations Research, INFORMS, vol. 67(6), pages 1628-1658, November.
- Polemis, Michael L. & Tzeremes, Nickolaos G., 2019. "Competitive conditions and sectors’ productive efficiency: A conditional non-parametric frontier analysis," European Journal of Operational Research, Elsevier, vol. 276(3), pages 1104-1118.
- Valiyattoor, Vipin & Bhandari, Anup Kumar, 2020. "Outsourcing and firm performance nexus: An analysis using the conventional and panel double-bootstrap procedure," Research in International Business and Finance, Elsevier, vol. 54(C).
- Kneip, Alois & Simar, Léopold & Wilson, Paul W., 2022. "Conical FDH Estimators of General Technologies, with Applications to Returns to Scale and Malmquist Productivity Indices," LIDAM Discussion Papers ISBA 2022024, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
- Michael L. Polemis & Thanasis Stengos & Nickolaos G. Tzeremes, 2020. "Modeling the effect of competition on US manufacturing sectors’ efficiency: an order-m frontier analysis," Journal of Productivity Analysis, Springer, vol. 54(1), pages 27-41, August.
- Cifuentes-Faura, Javier & Faura-Martínez, Ursula, 2023. "Measuring Spanish airport performance: A bootstrap data envelopment analysis of efficiency," Utilities Policy, Elsevier, vol. 80(C).
- Gearhart, Richard & Michieka, Nyakundi, 2019. "Natural resource abundance and healthcare efficiency in Appalachia: A robust conditional approach," Energy Policy, Elsevier, vol. 129(C), pages 985-996.
- Assaf, A. George & Tsionas, Mike G., 2019. "A review of research into performance modeling in tourism research - Launching the Annals of Tourism Research curated collection on performance modeling in tourism research," Annals of Tourism Research, Elsevier, vol. 76(C), pages 266-277.
- Marc Aliana & Diego Prior & Emili Tortosa-Ausina, 2024. "Assessing the impact of environmental factors on emergency healthcare quality: Implications for budget allocation," Working Papers 2024/04, Economics Department, Universitat Jaume I, Castellón (Spain).
- Bigerna, Simona & D'Errico, Maria Chiara & Polinori, Paolo, 2022. "Environmental variables and power firms' productivity: micro panel estimation with time-Invariant variables," MPRA Paper 114157, University Library of Munich, Germany.
- Mariarosaria Agostino & Sabrina Ruberto & Francesco Trivieri, 2018. "Lasting lending relationships and technical efficiency. Evidence on European SMEs," Journal of Productivity Analysis, Springer, vol. 50(1), pages 25-40, October.
- Hampf, Benjamin & Rødseth, Kenneth Løvold, 2019. "Environmental efficiency measurement with heterogeneous input quality: A nonparametric analysis of U.S. power plants," Energy Economics, Elsevier, vol. 81(C), pages 610-625.