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Implementing Large-Scale Optimization Models in Excel Using VBA

Author

Listed:
  • Larry J. LeBlanc

    (Owen Graduate School of Management, Vanderbilt University, Nashville, Tennessee 37203)

  • Michael R. Galbreth

    (Department of Management Science, Moore School of Business, University of South Carolina, Columbia, South Carolina 29208)

Abstract

We discuss the importance of spreadsheets for optimization modeling, including a description of their limitations for large-scale problems. We then describe efficient ways to overcome these limits. Our approach makes use of Excel’s standard functionality but augments Excel with its programming language, Visual Basic for Applications (VBA), where necessary. We show how using VBA within Excel to generate and solve large linear programs (LPs) overcomes many of the problems inherent in purely spreadsheet-based models and greatly increases model usability. The techniques described were instrumental in our successful development of a large-scale procurement/distribution LP that resulted in savings of approximately $1,000,000 in the first year, with even greater annual savings expected in the future.

Suggested Citation

  • Larry J. LeBlanc & Michael R. Galbreth, 2007. "Implementing Large-Scale Optimization Models in Excel Using VBA," Interfaces, INFORMS, vol. 37(4), pages 370-382, August.
    • Handle: RePEc:inm:orinte:v:37:y:2007:i:4:p:370-382
    DOI: 10.1287/inte.1060.0256
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    References listed on IDEAS

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    9. Thomas A. Grossman, 1999. "Teachers' Forum: Spreadsheet Modeling and Simulation Improves Understanding of Queues," Interfaces, INFORMS, vol. 29(3), pages 88-103, June.
    10. Larry J. LeBlanc & Dale Randels & T. K. Swann, 2000. "Heery International's Spreadsheet Optimization Model for Assigning Managers to Construction Projects," Interfaces, INFORMS, vol. 30(6), pages 95-106, December.
    11. Mandyam M. Srinivasan & Steven J. Ebbing & Alan T. Swearingen, 2003. "Woodward Aircraft Engine Systems Sets Work-in-Process Levels for High-Variety, Low-Volume Products," Interfaces, INFORMS, vol. 33(4), pages 61-69, August.
    12. Larry J. LeBlanc & James A. Hill & Gregory W. Greenwell & Alexandre O. Czesnat, 2004. "Nu-kote’s Spreadsheet Linear-Programming Models for Optimizing Transportation," Interfaces, INFORMS, vol. 34(2), pages 139-146, April.
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    Cited by:

    1. Larry J. LeBlanc & Thomas A. Grossman, 2008. "Introduction: The Use of Spreadsheet Software in the Application of Management Science and Operations Research," Interfaces, INFORMS, vol. 38(4), pages 225-227, August.
    2. Mauro Falasca & Christopher Zobel & Cliff Ragsdale, 2011. "Helping a Small Development Organization Manage Volunteers More Efficiently," Interfaces, INFORMS, vol. 41(3), pages 254-262, June.

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