Profile image of Johannes Ledolter
Robert Thomas Holmes Professor of Business Analytics

Contact

Positions

  • Professor of Business Analytics

    Tippie College of Business

  • Professor of Statistics and Actuarial Science

    College of Liberal Arts and Sciences

  • Associate Investigator

    Center for the Prevention and Treatment of Visual Loss, Iowa City VA Health Care System

  • Affiliate Faculty, Department of Statistics and Actuarial Science

    College of Liberal Arts and Sciences, The University of Iowa

Education

  • PhD in Statistics, University of Wisconsin, 1975
  • MS in Sociology and Statistics, University of Vienna, 1974
  • MS in Statistics, University of Wisconsin, 1972

Areas of Interest

  • Applied time series analysis
  • Data mining
  • Forecasting
  • International Business Education
  • Probability and statistics for engineering and physical sciences
  • Statistical applications in business
  • Statistical methods for quality and productivity improvement (Six Sigma)
  • Statistics
  • Statistics in Medicine, especially Anesthesia, Surgery, and Ophthalmology

Selected Awards & Honors

  • Iowa Career Developmental Award, University of Iowa, 2012
  • Elected Fellow, American Society for Quality, 2011
  • Iowa Career Developmental Award, 2006
  • Elected Fellow, International Statistical Institute, 1991
  • Elected Fellow, American Statistical Association, 1991

Selected Publications

  • Ledolter, J. (2009). Estimation Bias in the First-Order Autoregressive Model and its Impact on Predictions and Prediction Intervals. Communications in Statistics: Simulation and Computation 38 771-787.
  • Bell, G. H., Ledolter, J. & Swersey, A. J. (2009). An Experiment to Increase Magazine Sales in a Supermarket. Interfaces 39 145-158.
  • Dexter, F., Epstein, R. H., Elgart, R. L., Lee, J. D. & Ledolter, J. (2009). Automatic Updating of Times Remaining in Surgical Cases Using Bayesian Analysis of Historical Case Duration Data. Anesthesia & Analgesia 108 929-940.
  • Rautianinen, R., Ledolter, J., Donham, K. J., Ohsfeldt, R. & Zwerling, C. (2009). Risk Factors for Serious Injury in Finnish Agriculture. American Journal of Industrial Medicine 52 419-428.
  • Ledolter, J. & Hogg, R. V. (2009). Statistics for Engineers and Scientists. Prentice Hall.
  • Ledolter, J. (2008). A Statistical Analysis of the Lake Levels at Lake Neusiedl. Austrian Journal of Statistics 37 147-160.
  • Ledolter, J. (2008). Comment on the paper “An Overview of the Shainin SystemTM for Quality Improvement,” by Stefan H. Steiner, R. Jock MacKay, and John S. Ramberg. Quality Engineering 20 38-39.
  • Ledolter, J. (2008). Pre-control. Encyclopedia of Statistics in Quality and Reliability.
  • Dexter, F., Xin, L., O'Neil, L. & Ledolter, J. (2008). Sensitivity of Super-Efficient Data Envelopment Analysis Results to Individual Decision-Making Units: Example of Surgical Workload by Specialty. Health Care Management Science 11 307-318.
  • Ledolter, J. (2008). Smoothing Time Series with Local Polynomial Regression on Time. Communications in Statistics - Theory and Methods 37 (6) 959-971.

Selected Presentations

  • Ledolter, J. (2019, October) How George Box has Shaped my Work as Data Scientist: Treatment of Visual Loss and the Effects of Traumatic Brain Injury. Invited Lecture presented at George Box: 100th Birthday Celebration of the Accidental Statistician, Madison, Wisconsin.
  • Ledolter, J. (2019, June) Data Science Projects: Treatment of Visual Loss and Effects of Traumatic Brain Injury. Invited Lecture Valparaiso, Chile.
  • Ledolter, J. (2018, March) Data Science Projects Treatment of Visual Loss and Effects of Traumatic Brain Injury. Invited Lecture
  • Ledolter, J. (2015, June) Data mining and business analytics with an Application to Forecasting State Unemployment Rates. Lecture presented at National Research University-Higher School of Economics, Moscow, Russia.
  • Ledolter, J. (2015, April) Data mining and business analytics. Lecture presented at University of Northern Iowa, Cedar Falls.
  • Ledolter, J. (2015, March) Data mining and business analytics: Statistical models. Lecture presented at Peking University, Beijing, China.
  • Ledolter, J. (2014, May) George Box’s contributions to time series analysis and forecasting. Lecture presented at Department of Statistics, University of Linz, Linz, Austria.
  • Ledolter, J. (2014, April) Data mining and business analytics with big and small data – it is not always size that matters. Keynote/Plenary Address presented at ASA Milwaukee Chapter, Milwaukee, Wisconsin.
  • Ledolter, J. (2013, December) Combination of Forecasts and Bayesian Prediction Bounds for Operating Room Durations, Even for Procedures with Few or No Historical Data. Oral presented at Frontiers of Statistics and Forecasting, Taipei, Taiwan.
  • Ledolter, J. (2013, March) Comments on Statistical Engineering. Oral presented at Stu Hunter Research Conference, Amsterdam, Netherlands.

Selected Grants & Contracts

  • Ledolter, J Grant Research, Basic. Center for the Prevention and Treatment of Visual Loss. Sponsored by VA. Funded. August 1, 2017 - July 1, 2018.
  • Ledolter, J Grant Research, Basic. Center for the Prevention and Treatment of Visual Loss. Sponsored by US Department of Veterans Affairs. Funded. August 1, 2015 - July 1, 2016.
  • Ledolter, Johannes Center for the Prevention and Treatment of Visual Loss. Sponsored by US Department of Veterans Affairs. Funded. August 1, 2014 - May 1, 2015.
  • Ledolter, Johannes Center for the Prevention and Treatment of Visual Loss. Sponsored by US Department of Veterans Affairs. Funded. August 1, 2013 - May 1, 2014.
  • Ledolter, Johannes (Principal Investigator) Center for the Prevention and Treatment of Visual Loss. Sponsored by US Department of Veterans Affairs. Funded. August 1, 2012 - December 31, 2013.
  • Ledolter, Johannes Center for the Prevention and Treatment of Visual Loss. Sponsored by US Department of Veterans Affairs. Funded. May 1, 2011 - August 31, 2011.

Professional Service

  • NBER/NSF Seminar on Time Series Analysis, Conference Organizer for Annual Conference in Vienna, Austria, January 2015 - September 2015.

Editorial & Review Activities

  • Austrian Journal of Statistics, Associate Editor.
  • Journal of Forecasting, Associate Editor.