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Sensitivity analysis of efficiency and Malmquist productivity indices: An application to Spanish savings banks

  • Tortosa-Ausina, Emili
  • Grifell-Tatje, Emili
  • Armero, Carmen
  • Conesa, David

Hypothesis testing and statistical precision in the context of nonparametric efficiency and productivity measurement have been investigated since the early 1990s. Recent contributions focus on this matter through the use of resampling methods?i.e., bootstrapping techniques. However, empirical evidence is still practically non-existent. This gap is more noticeable in the case of banking efficiency studies, where the literature is immense. In this paper, we explore productivity growth and productive efficiency for Spanish savings banks over the (initial) post-deregulation period 1992?1998 using Data Envelopment Analysis (DEA) and bootstrapping techniques. Results show that productivity growth has occurred, mainly due to improvement in production possibilities, and that mean efficiency has remained fairly constant over time. The bootstrap analysis yields further evidence, as for many firms productivity growth, or decline, is not statistically significant. With regard to efficiency measurement, the bootstrap reveals that the disparities in the original efficiency scores of some firms are lessened to a great extent. Desde principios de los años noventa ha habido avances notables en el contraste de hipótesis dentro del contexto de la medición de la eficiencia y la productividad mediante técnicas paramétricas. Las contribuciones más recientes han enfocado el tema a través de métodos de remuestreo -conocidos en la literatura como técnicas bootstrap-. Sin embargo, prácticamente no ha habido aplicaciones, algo también patente en el estudio de la eficiencia de la empresa bancaria. En este artículo, analizamos la eficiencia productiva y el crecimiento de la productividad de las cajas de ahorro españolas durante el periodo 1992-1998 a través de técnicas no paramétricas (DEA) y de técnicas bootstrap, con el fin de poder realizar inferencia estadística. Los resultados indican que la productividad ha aumentado, principalmente debido a una mejora en las posibilidades de producción,

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Article provided by Elsevier in its journal European Journal of Operational Research.

Volume (Year): 184 (2008)
Issue (Month): 3 (February)
Pages: 1062-1084

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Handle: RePEc:eee:ejores:v:184:y:2008:i:3:p:1062-1084
Contact details of provider: Web page: http://www.elsevier.com/locate/eor

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  1. Gorton, Gary & Rosen, Richard, 1995. " Corporate Control, Portfolio Choice, and the Decline of Banking," Journal of Finance, American Finance Association, vol. 50(5), pages 1377-1420, December.
  2. Léopold Simar & Paul W. Wilson, 1998. "Sensitivity Analysis of Efficiency Scores: How to Bootstrap in Nonparametric Frontier Models," Management Science, INFORMS, vol. 44(1), pages 49-61, January.
  3. Ferrier, G.D. & Hirschberg, J.G., 1998. "Can We Bootstrap DEA Scores?," Department of Economics - Working Papers Series 627, The University of Melbourne.
  4. Subal C. Kumbhakar & Ana Lozano-Vivas & C. A. Knox Lovell & Iftekhar Hasan, 1999. "The Effects of Deregulation on the Performance of Financial Institutions: The Case of Spanish Savings Banks," New York University, Leonard N. Stern School Finance Department Working Paper Seires 99-064, New York University, Leonard N. Stern School of Business-.
  5. SIMAR, Léopold & WILSON, Paul, 1996. "Estimating and bootstrapping malmquist indices," CORE Discussion Papers 1996060, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  6. Xavier Freixas, 2003. "An overall perspective on banking regulation," Economics Working Papers 664, Department of Economics and Business, Universitat Pompeu Fabra.
  7. David C. Wheelock & Paul W. Wilson, 1996. "Technical progress, inefficiency and productivity change in U.S. banking, 1984-1993," Working Papers 1994-021, Federal Reserve Bank of St. Louis.
  8. Ferrier, Gary D. & Grosskopf, Shawna & Hayes, Kathy J. & Yaisawarng, Suthathip, 1993. "Economies of diversification in the banking industry : A frontier approach," Journal of Monetary Economics, Elsevier, vol. 31(2), pages 229-249, April.
  9. X. M. Gonzalez & D. Miles, 2002. "Statistical precision of DEA: a bootstrap application to Spanish public services," Applied Economics Letters, Taylor & Francis Journals, vol. 9(2), pages 127-132.
  10. Joel L. Horowitz, 1996. "Bootstrap Methods in Econometrics: Theory and Numerical Performance," Econometrics 9602009, EconWPA, revised 05 Mar 1996.
  11. C.A. Lovell, 2000. "Editor's Introduction," Journal of Productivity Analysis, Springer, vol. 13(1), pages 5-6, January.
  12. Mukherjee, Kankana & Ray, Subhash C. & Miller, Stephen M., 2001. "Productivity growth in large US commercial banks: The initial post-deregulation experience," Journal of Banking & Finance, Elsevier, vol. 25(5), pages 913-939, May.
  13. Gilbert, R. Alton & Wilson, Paul W., 1998. "Effects of Deregulation on the Productivity of Korean Banks," Journal of Economics and Business, Elsevier, vol. 50(2), pages 133-155, March.
  14. José Manuel Pastor Monsálvez, 1995. "Eficiencia, Cambio Productivo Y Cambio Técnico En Los Bancos Y Cajas De Ahorro Españolas: Un Análisis Frontera No Paramétrico," Working Papers. Serie EC 1995-09, Instituto Valenciano de Investigaciones Económicas, S.A. (Ivie).
  15. Grifell-Tatje, E. & Lovell, C. A. K., 1997. "The sources of productivity change in Spanish banking," European Journal of Operational Research, Elsevier, vol. 98(2), pages 364-380, April.
  16. Fare, Rolf & Shawna Grosskopf & Mary Norris & Zhongyang Zhang, 1994. "Productivity Growth, Technical Progress, and Efficiency Change in Industrialized Countries," American Economic Review, American Economic Association, vol. 84(1), pages 66-83, March.
  17. Rolf Färe & Gerald Whittaker, 1995. "An Intermediate Input Model Of Dairy Production Using Complex Survey Data," Journal of Agricultural Economics, Wiley Blackwell, vol. 46(2), pages 201-213.
  18. repec:cup:cbooks:9780521453455 is not listed on IDEAS
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