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Citations for "One-Step and Two-Step Estimation of the Effects of Exogenous Variables on Technical Efficiency Levels"

by Hung-jen Wang & Peter Schmidt

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  1. Federico Belotti & Giuseppe Ilardi, 2012. "Consistent Estimation of the “True” Fixed-effects Stochastic Frontier Model," CEIS Research Paper 231, Tor Vergata University, CEIS, revised 18 Apr 2012.
  2. Fabio Pieri & Enrico Zaninotto, 2013. "Vertical integration and efficiency: an application to the Italian machine tool industry," Small Business Economics, Springer, vol. 40(2), pages 397-416, February.
  3. Mehdi Farsi & Massimo Filippini & Michael Kuenzle, 2004. "Cost Efficiency in Regional Bus Companies: An Application of Alternative Stochastic Frontier Models," CEPE Working paper series 04-33, CEPE Center for Energy Policy and Economics, ETH Zurich.
  4. Jaenicke, Edward C. & Frechette, Darren L. & Larson, James A., 2003. "Estimating Production Risk and Inefficiency Simultaneously: An Application to Cotton Cropping Systems," Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 28(03), December.
  5. Farsi, Mehdi & Filippini, Massimo, 2009. "An analysis of cost efficiency in Swiss multi-utilities," Energy Economics, Elsevier, vol. 31(2), pages 306-315, March.
  6. Benjamin M. Tabak & Dimas M. Fazio & Daniel O. Cajueiro, 2011. "Profit, Cost and Scale Efficiency for Latin American Banks: Concentration-Performance Relationship," Working Papers Series 244, Central Bank of Brazil, Research Department.
  7. Valeria Cosmo, 2013. "Ownership, Scale Economies and Efficiency in the Italian Water Sector," Journal of Industry, Competition and Trade, Springer, vol. 13(3), pages 399-415, September.
  8. Ngoc-Anh Vo Thi & Dev Vencappa, 2008. "Does the Entry Mode of Foreign Banks Matter for Bank Efficiency? Evidence from the Czech Republic,Hungary, and Poland," William Davidson Institute Working Papers Series wp925, William Davidson Institute at the University of Michigan.
  9. Silvio Daidone & Francesco D’Amico, 2009. "Technical efficiency, specialization and ownership form: evidences from a pooling of Italian hospitals," Journal of Productivity Analysis, Springer, vol. 32(3), pages 203-216, December.
  10. Marko Košak & Peter Zajc & Jelena Zorić, 2009. "Bank efficiency differences in the new EU member states," Baltic Journal of Economics, Baltic International Centre for Economic Policy Studies, vol. 9(2), pages 67-90, December.
  11. Francesco Aiello & Graziella Bonanno, 2013. "Profit and cost efficiency in the Italian banking industry (2006-2011)," Economics and Business Letters, Oviedo University Press, vol. 2(4).
  12. Richard Harris, 2009. "Spillover and backward linkage effects of FDI: empirical evidence for the UK," LSE Research Online Documents on Economics 33206, London School of Economics and Political Science, LSE Library.
  13. Adnan Kasman & Canan Yildirim, 2006. "Cost and profit efficiencies in transition banking: the case of new EU members," Applied Economics, Taylor & Francis Journals, vol. 38(9), pages 1079-1090.
  14. Liu, Yanyan, 2006. "Model Selection in Stochastic Frontier Analysis: Maize Production in Kenya," 2006 Annual meeting, July 23-26, Long Beach, CA 21281, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
  15. Manlagñit, Maria Chelo V., 2011. "Cost efficiency, determinants, and risk preferences in banking: A case of stochastic frontier analysis in the Philippines," Journal of Asian Economics, Elsevier, vol. 22(1), pages 23-35, February.
  16. Gronberg, Timothy J. & Jansen, Dennis W. & Taylor, Lori L., 2012. "The relative efficiency of charter schools: A cost frontier approach," Economics of Education Review, Elsevier, vol. 31(2), pages 302-317.
  17. Llorca, Manuel & Orea, Luis & Pollitt, Michael, 2013. "Efficiency and Environmental Factors in the US Electricity Transmission Industry," Cambridge Working Papers in Economics 1318, Faculty of Economics, University of Cambridge.
  18. Subal Kumbhakar & Christopher Parmeter, 2010. "Estimation of hedonic price functions with incomplete information," Empirical Economics, Springer, vol. 39(1), pages 1-25, August.
  19. De Jonghe, O.G. & Disli, M. & Schoors, K., 2011. "Corporate Governance, Opaque Bank Activities, and Risk/Return Efficiency: Pre- and Post-Crisis Evidence from Turkey," Discussion Paper 2011-129, Tilburg University, Center for Economic Research.
  20. Jorge Galán & Helena Veiga & Michael Wiper, 2014. "Bayesian estimation of inefficiency heterogeneity in stochastic frontier models," Journal of Productivity Analysis, Springer, vol. 42(1), pages 85-101, August.
  21. Richard Harris & Qian Cher Li, 2007. "Learning-by-Exporting? Firm-Level Evidence for UK Manufacturing and Services Sectors," Working Papers 2007_22, Business School - Economics, University of Glasgow.
  22. Tiziana Laureti, 2008. "Modelling Exogenous Variables in Human Capital Formation through a Heteroscedastic Stochastic Frontier," International Advances in Economic Research, Springer, vol. 14(1), pages 76-89, February.
  23. Meesters, Aljar & Lensink, Robert & Hermes, Niels, 2008. "Outreach and Efficiency of Microfinance Institutions," Research Report 08002, University of Groningen, Research Institute SOM (Systems, Organisations and Management).
  24. William Greene, 2003. "Distinguishing Between Heterogeneity and Inefficiency: Stochastic Frontier Analysis of the World Health Organization’s Panel Data on National Health Care Systems," Working Papers 03-10, New York University, Leonard N. Stern School of Business, Department of Economics.
  25. Mohanty, Sunil K. & Lin, Winston T. & Lin, Hong-Jen, 2013. "Measuring cost efficiency in presence of heteroskedasticity: The case of the banking industry in Taiwan," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 26(C), pages 77-90.
  26. Lensink, Robert & Meesters, Aljar & Naaborg, Ilko, 2008. "Bank efficiency and foreign ownership: Do good institutions matter?," Journal of Banking & Finance, Elsevier, vol. 32(5), pages 834-844, May.
  27. Gabriel Asaftei & Subal Kumbhakar, 2008. "Regulation and efficiency in transition: the case of Romanian banks," Journal of Regulatory Economics, Springer, vol. 33(3), pages 253-282, June.
  28. Thompson, Herbert Jr. & Garbacz, Christopher, 2007. "Mobile, fixed line and Internet service effects on global productive efficiency," Information Economics and Policy, Elsevier, vol. 19(2), pages 189-214, June.
  29. Tran, Kien C. & Tsionas, Efthymios G., 2009. "Estimation of nonparametric inefficiency effects stochastic frontier models with an application to British manufacturing," Economic Modelling, Elsevier, vol. 26(5), pages 904-909, September.
  30. Groot, Tom & Garcia-Valderrama, Teresa, 2006. "Research quality and efficiency: An analysis of assessments and management issues in Dutch economics and business research programs," Research Policy, Elsevier, vol. 35(9), pages 1362-1376, November.
  31. Michelle Phillips, 2013. "Inefficiency in Japanese water utility firms: a stochastic frontier approach," Journal of Regulatory Economics, Springer, vol. 44(2), pages 197-214, October.
  32. Kuosmanen, Timo, 2006. "Stochastic Nonparametric Envelopment of Data: Combining Virtues of SFA and DEA in a Unified Framework," Discussion Papers 11864, MTT Agrifood Research Finland.
  33. Jacob A. Bikker & Barbara Casu & Claudia Girardone & Mohamed E Chaffai & Michel Dietsch & Antonio Colangelo & Robert Inklaar & Marco Colagiovanni & Martin Czurda & Roger Hartmann & Charles-Henri Di Ma, 2009. "Productivity in the Financial Services Sector," SUERF Studies, SUERF - The European Money and Finance Forum, number 2009/4 edited by Morten Balling & Ernest Gnan & Frank Lierman & Jean-Pierre Schoder.
  34. Shinji Yane & Sanford Berg, 2013. "Sensitivity analysis of efficiency rankings to distributional assumptions: applications to Japanese water utilities," Applied Economics, Taylor & Francis Journals, vol. 45(17), pages 2337-2348, June.
  35. Wang, Hung-Jen & Ho, Chia-Wen, 2009. "Estimating fixed-effect panel stochastic frontier models by model transformation," MPRA Paper 31081, University Library of Munich, Germany.
  36. Fenn, Paul & Vencappa, Dev & Diacon, Stephen & Klumpes, Paul & O'Brien, Chris, 2008. "Market structure and the efficiency of European insurance companies: A stochastic frontier analysis," Journal of Banking & Finance, Elsevier, vol. 32(1), pages 86-100, January.
  37. Subal Kumbhakar & Dan Wang, 2007. "Economic reforms, efficiency and productivity in Chinese banking," Journal of Regulatory Economics, Springer, vol. 32(2), pages 105-129, October.
  38. Alejandro Esteller-Moré, 2011. "Is the tax administration just a money machine? Empirical evidence on redistributive politics," Economics of Governance, Springer, vol. 12(3), pages 275-299, September.
  39. Barros, Carlos Pestana & Williams, Jonathan, 2013. "The random parameters stochastic frontier cost function and the effectiveness of public policy: Evidence from bank restructuring in Mexico," International Review of Financial Analysis, Elsevier, vol. 30(C), pages 98-108.
  40. Mastromarco Camilla & Laura Serlenga & Yongcheol Shin, 2013. "Globalisation and technological convergence in the EU," Journal of Productivity Analysis, Springer, vol. 40(1), pages 15-29, August.
  41. Cliff Huang & Hung-pin Lai, 2012. "Estimation of stochastic frontier models based on multimodel inference," Journal of Productivity Analysis, Springer, vol. 38(3), pages 273-284, December.
  42. Williams, Jonathan & Nguyen, Nghia, 2005. "Financial liberalisation, crisis, and restructuring: A comparative study of bank performance and bank governance in South East Asia," Journal of Banking & Finance, Elsevier, vol. 29(8-9), pages 2119-2154, August.
  43. Kumbhakar, Subal C. & Wang, Hung-Jen, 2006. "Pitfalls in the estimation of a cost function that ignores allocative inefficiency: A Monte Carlo analysis," Journal of Econometrics, Elsevier, vol. 134(2), pages 317-340, October.
  44. Richard A. Hofler & James E. Payne, 2006. "Efficiency in the National Basketball Association: a stochastic frontier approach with panel data," Managerial and Decision Economics, John Wiley & Sons, Ltd., vol. 27(4), pages 279-285.
  45. Badiane, Ousmane & Ulimwengu, John, 2009. "The growth-poverty convergence agenda: Optimizing social expenditures to maximize their impact on agricultural labor productivity, growth, and poverty reduction in Africa," IFPRI discussion papers 906, International Food Policy Research Institute (IFPRI).
  46. Sun, Kai & Kumbhakar, Subal C., 2013. "Semiparametric smooth-coefficient stochastic frontier model," Economics Letters, Elsevier, vol. 120(2), pages 305-309.
  47. Koutsomanoli-Filippaki, Anastasia & Margaritis, Dimitris & Staikouras, Christos, 2009. "Efficiency and productivity growth in the banking industry of Central and Eastern Europe," Journal of Banking & Finance, Elsevier, vol. 33(3), pages 557-567, March.
  48. Federico Belotti & Silvio Daidone & Giuseppe Ilardi & Vincenzo Atella, 2013. "Stochastic frontier analysis using Stata," Stata Journal, StataCorp LP, vol. 13(4), pages 718-758, December.
  49. Kuo, Jenn-Shyong & Ho, Yi-Cheng, 2008. "The cost efficiency impact of the university operation fund on public universities in Taiwan," Economics of Education Review, Elsevier, vol. 27(5), pages 603-612, October.
  50. Jiang, Chunxia & Yao, Shujie & Zhang, Zongyi, 2009. "The effects of governance changes on bank efficiency in China: A stochastic distance function approach," China Economic Review, Elsevier, vol. 20(4), pages 717-731, December.
  51. Andrew Tiffin, 2006. "Ukraine," IMF Working Papers 06/167, International Monetary Fund.
  52. Andrew Johnson & Timo Kuosmanen, 2011. "One-stage estimation of the effects of operational conditions and practices on productive performance: asymptotically normal and efficient, root-n consistent StoNEZD method," Journal of Productivity Analysis, Springer, vol. 36(2), pages 219-230, October.
  53. Uwe Jensen & Hermann Gartner & Susanne Rässler, 2010. "Estimating German overqualification with stochastic earnings frontiers," AStA Advances in Statistical Analysis, Springer, vol. 94(1), pages 33-51, March.
  54. Rao, Elizaphan J.O. & Brummer, Bernhard & Qaim, Matin, 2011. "Farmer Participation in Supermarket Channels, Production Technology, and Efficiency: The Case of Vegetables in Kenya," Discussion Papers 113508, Georg-August-Universitaet Goettingen, GlobalFood, Department of Agricultural Economics and Rural Development.
  55. Williams, Jonathan, 2004. "Determining management behaviour in European banking," Journal of Banking & Finance, Elsevier, vol. 28(10), pages 2427-2460, October.
  56. Bonanno, Graziella, 2012. "L’efficienza del sistema bancario italiano dal 2006 al 2010. Un’applicazione delle frontiere stocastiche
    [The Efficiency of Italian Banking System over 2006-2010. An Application of the Stochast
    ," MPRA Paper 42831, University Library of Munich, Germany.
  57. Carola Pessino & Ricardo Fenochietto, 2010. "Determining countries’ tax effort," Hacienda Pública Española, IEF, vol. 195(4), pages 65-87, december.
  58. Chen, Ku-Hsieh, 2012. "Incorporating risk input into the analysis of bank productivity: Application to the Taiwanese banking industry," Journal of Banking & Finance, Elsevier, vol. 36(7), pages 1911-1927.
  59. Kuosmanen, Timo & Post, Thierry & Scholtes, Stefan, 2007. "Non-parametric tests of productive efficiency with errors-in-variables," Journal of Econometrics, Elsevier, vol. 136(1), pages 131-162, January.
  60. Annika Herr & Hendrik Schmitz & Boris Augurzky, 2009. "Does Higher Cost Inefficiency Imply Higher Profit Inefficiency? - Evidence on Inefficiency and Ownership of German Hospitals," Ruhr Economic Papers 0132, Rheinisch-Westfälisches Institut für Wirtschaftsforschung, Ruhr-Universität Bochum, Universität Dortmund, Universität Duisburg-Essen.
  61. Wollni, Meike & Brümmer, Bernhard, 2012. "Productive efficiency of specialty and conventional coffee farmers in Costa Rica: Accounting for technological heterogeneity and self-selection," Food Policy, Elsevier, vol. 37(1), pages 67-76.
  62. Zoghbi, Ana Carolina & Rocha, Fabiana & Mattos, Enlinson, 2013. "Education production efficiency: Evidence from Brazilian universities," Economic Modelling, Elsevier, vol. 31(C), pages 94-103.
  63. Guilherme Berse Rodrigues Lambais & Marcelo Marques De Magalhães & José Maria Ferreira Jardim Da Silveira, 2014. "Land Reform And Technical Efficiency: Panel Data Evidence From Northeastern Brazil," Anais do XL Encontro Nacional de Economia [Proceedings of the 40th Brazilian Economics Meeting] 200, ANPEC - Associação Nacional dos Centros de Pósgraduação em Economia [Brazilian Association of Graduate Programs in Economics].
  64. Laurent Weill, 2008. "Leverage and corporate performance: does institutional environment matter?," ULB Institutional Repository 2013/14343, ULB -- Universite Libre de Bruxelles.
  65. Greene, William, 2005. "Reconsidering heterogeneity in panel data estimators of the stochastic frontier model," Journal of Econometrics, Elsevier, vol. 126(2), pages 269-303, June.
  66. Dongwei Su & Xingxing He, 2012. "Ownership structure, corporate governance and productive efficiency in China," Journal of Productivity Analysis, Springer, vol. 38(3), pages 303-318, December.
  67. Tauer, Loren W. & Mishra, Ashok K., 2005. "U.S. Dairy Farm Cost Efficiency," Working Papers 127079, Cornell University, Department of Applied Economics and Management.
  68. Meike Wollni & Bernhard Brümmer, 2009. "Productive efficiency of specialty and conventional coffee farmers in Costa Rica: Accounting for technological heterogeneity and self-selection," Courant Research Centre: Poverty, Equity and Growth - Discussion Papers 13, Courant Research Centre PEG.
  69. Johnson, Andrew L. & Kuosmanen, Timo, 2012. "One-stage and two-stage DEA estimation of the effects of contextual variables," European Journal of Operational Research, Elsevier, vol. 220(2), pages 559-570.
  70. Magalhães, Marcelo Marques de & Souza Filho, Hildo Meirelles de & Sousa, Miguel Rocha de & Silveira, José Maria F. J. da & Buainain, Antônio Márcio, 2011. "Land Reform in NE Brazil: a stochastic frontier production efficiency evaluation," Brazilian Journal of Rural Economy and Sociology (RESR), Sociedade Brasileira de Economia e Sociologia Rural, vol. 49(1), March.
  71. Adnan Kasman & Saadet Kirbas Kasman & Oscar Carvallo, 2005. "Efficiency and Foreign Ownership in Banking: An International Comparison," Discussion Paper Series 05/03, Dokuz Eylül University, Faculty of Business, Department of Economics, revised 23 Nov 2005.
  72. Anup Bhandari & Pradip Maiti, 2012. "Efficiency of the Indian leather firms: some results obtained using the two conventional methods," Journal of Productivity Analysis, Springer, vol. 37(1), pages 73-93, February.
  73. Peter Schmidt, 2011. "One-step and two-step estimation in SFA models," Journal of Productivity Analysis, Springer, vol. 36(2), pages 201-203, October.
  74. Zhang, Jianhua & Wang, Peng & Qu, Baozhi, 2012. "Bank risk taking, efficiency, and law enforcement: Evidence from Chinese city commercial banks," China Economic Review, Elsevier, vol. 23(2), pages 284-295.
  75. Miljkovic, Dragan & Shaik, Saleem, 2010. "The Impact of Trade Openness on Technical Efficiency in U.S. Agriculture," Agribusiness & Applied Economics Report 95749, North Dakota State University, Department of Agribusiness and Applied Economics.
  76. Chih-Hai Yang & Ku-Hsieh Chen, 2009. "Are small firms less efficient?," Small Business Economics, Springer, vol. 32(4), pages 375-395, April.
  77. Koutsomanoli-Filippaki, Anastasia & Mamatzakis, Emmanuel & Staikouras, Christos, 2009. "Structural reforms and banking efficiency in the new EU States," Journal of Policy Modeling, Elsevier, vol. 31(1), pages 17-21.
  78. Kuosmanen, Timo & Saastamoinen, Antti & Sipiläinen, Timo, 2013. "What is the best practice for benchmark regulation of electricity distribution? Comparison of DEA, SFA and StoNED methods," Energy Policy, Elsevier, vol. 61(C), pages 740-750.
  79. Curtiss, Jarmila & Brummer, Bernhard & Medonos, Tomas & Weaver, Robert D., 2005. "Structural Change in Transition: A Role for Organizational Legitimacy? Evidence from Czech Agriculture," 2005 International Congress, August 23-27, 2005, Copenhagen, Denmark 24557, European Association of Agricultural Economists.
  80. Krishna G. Iyer & Alicia N. Rambaldi & Kam Ki Tang, 2008. "Efficiency externalities of trade and alternative forms of foreign investment in OECD countries," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 23(6), pages 749-766.
  81. Conroy, Stephen J. & Arguea, Nestor M., 2008. "An estimation of technical efficiency for Florida public elementary schools," Economics of Education Review, Elsevier, vol. 27(6), pages 655-663, December.
  82. Kumar, Surender & Kumar, Sudesh, 2013. "Does Modernization Improve Performance: Evidence from Indian Police," MPRA Paper 45801, University Library of Munich, Germany.
  83. Pacheco, Francisca & Sanchez, Rafael & Villena, Mauricio, 2014. "A Longitudinal Parametric Approach to Estimate Local Government Efficiency," MPRA Paper 54918, University Library of Munich, Germany.
  84. Giannis Karagiannis, 2005. "Explaining output growth with a heteroscedastic non-neutral production frontier: the case of sheep farms in Greece," European Review of Agricultural Economics, Foundation for the European Review of Agricultural Economics, vol. 32(1), pages 51-74, March.
  85. Kinda, Tidiane, 2009. "Foreign ownership, sales to multinationals, and firm efficiency: The Case of Brazil, Morocco, Pakistan, South Africa, and Vietnam," MPRA Paper 19160, University Library of Munich, Germany.
  86. Larson, Donald F. & Plessmann, Frank, 2009. "Do farmers choose to be inefficient? Evidence from Bicol," Journal of Development Economics, Elsevier, vol. 90(1), pages 24-32, September.
  87. Vincenzo Atella & Federico Belotti & Silvio Daidone & Giuseppe Ilardi & Giorgia Marini, 2012. "Cost-containment policies and hospital efficiency: evidence from a panel of Italian hospitals," CEIS Research Paper 228, Tor Vergata University, CEIS, revised 13 Apr 2012.
  88. Helmut Herwartz & Christoph Strumann, 2014. "Hospital efficiency under prospective reimbursement schemes: an empirical assessment for the case of Germany," The European Journal of Health Economics, Springer, vol. 15(2), pages 175-186, March.
  89. Grigol, Modebadze, 2011. "Foreign Investment Effects on the Banking Sector in Georgia," MPRA Paper 32897, University Library of Munich, Germany.
  90. Wang, Hung-Jen, 2002. "Heteroscedasticity and non-monotonic efficiency effects of a stochastic frontier model," MPRA Paper 31076, University Library of Munich, Germany.
  91. Martin Falk, 2009. "Are multi-resort ski conglomerates more efficient?," Managerial and Decision Economics, John Wiley & Sons, Ltd., vol. 30(8), pages 529-538.
  92. Zhang, Yanjie & Wang, Xiaobing, 2009. "Land Reallocation and Its Impacts on Technical Efficiency --Evidence from China’s Agricultural Production," 2009 Conference, August 16-22, 2009, Beijing, China 51954, International Association of Agricultural Economists.
  93. Annika Frohloff, 2007. "Cost and Technical Efficiency of German Hospitals – A Stochastic Frontier Analysis," Ruhr Economic Papers 0002, Rheinisch-Westfälisches Institut für Wirtschaftsforschung, Ruhr-Universität Bochum, Universität Dortmund, Universität Duisburg-Essen.
  94. Hsu, Chih-Chiang & Lin, Chang-Ching & Yin, Shou-Yung, 2012. "Estimation of a panel stochastic frontier model with unobserved common shocks," MPRA Paper 37313, University Library of Munich, Germany.
  95. Moyo, Busani, 2013. "Power infrastructure quality and manufacturing productivity in Africa: A firm level analysis," Energy Policy, Elsevier, vol. 61(C), pages 1063-1070.
  96. Johannes Sauer & Klaus Frohberg, 2007. "Allocative efficiency of rural water supply – a globally flexible SGM cost frontier," Journal of Productivity Analysis, Springer, vol. 27(1), pages 31-40, February.
  97. Castiglione, Concetta & Infante, Davide, 2012. "ICTs and lags in technical efficiency gains. A stochastic frontier approach over a panel of Italian manufacturing firms," MPRA Paper 51071, University Library of Munich, Germany.
  98. Hailu, Getu & Goddard, Ellen W. & Jeffrey, Scott R., 2005. "Measuring Efficiency in Fruit and Vegetable Marketing Co-operatives with Heterogeneous Technologies in Canada," 2005 Annual meeting, July 24-27, Providence, RI 19507, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
  99. Iva Tomic, 2012. "The Efficiency of the Matching Process: Exploring the Impact of Regional Employment Offices in Croatia," Working Papers 1204, The Institute of Economics, Zagreb.
  100. Helmut Herwartz & Christoph Strumann, 2012. "On the effect of prospective payment on local hospital competition in Germany," Health Care Management Science, Springer, vol. 15(1), pages 48-62, March.
  101. Mäkinen, Mikko, 2007. "Do Stock Opiton Schemes Affect Technical Inefficiency? Evidence from Finland," Discussion Papers 1085, The Research Institute of the Finnish Economy.
  102. Kim, Myungsup & Schmidt, Peter, 2008. "Valid tests of whether technical inefficiency depends on firm characteristics," Journal of Econometrics, Elsevier, vol. 144(2), pages 409-427, June.