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Johannes  Ledolter

Johannes Ledolter Management Sciences

Professor, Management Sciences/Statistics & Actuarial Science
C. Maxwell Stanley Professor of International Operations Management
319-335-3814
johannes-ledolter@uiowa.edu
S352  John Pappajohn Bus Bldg
The University of Iowa, Iowa City, IA 52242-1994

Academic History

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

Expertise

  • 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

Awards

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

Selected Publications

  • A New Methodology and Effective Decision Rule for Distinguishing Between Minimal and Larger Prostate Cancers Based on PSA, Prostate Volume, Number of Cores Sampled, and Total Length of Cancer on Needle Biopsy, A J. Swersey, J Colberg, R Evans, Johannes Ledolter, R Parker
  • George Box’s Contributions to Time Series Analysis and Forecasting, Greta Ljung, Johannes Ledolter, Bovas Abraham, Applied Stochastic Models in Business and Industry, vol 30, 2014, 25-36
  • Forecasting State Unemployment Rates: A Robust Clustering Approach, Y Wang, R S. Tsay, Johannes Ledolter, K M. Shrestha, Journal of Forecasting, vol 32, 2013, 673-684
  • Borrowing the Best from Industrial Process Control for Detecting Progression of Eye Disease: CUSUM Charts for Assessing the Visual Field and Retinal Nerve Fiber Layer Thickness, Johannes Ledolter, Randy Kardon, Translational Vision Science & Technology, vol 2, 2013, 1-9
  • Economic Field Experiments: Comments on Design Efficiency, Sample Size and Statistical Power, Johannes Ledolter, Journal of Economics and Management, vol 9, 2013, 271-290
  • Value of a Scheduled Duration Quantified in Terms of Equivalent Numbers of Historical Cases, F Dexter, Johannes Ledolter, V Tiwari, R Epstein, Anesthesia & Analgesia, vol 117, 2013, 204-209
  • Data Mining and Business Analytics with R, Johannes Ledolter, Wiley & Sons, 2013
  • Estimating Surgical Case Durations and Making Comparisons among Facilities: Application to Identifying Facilities with Loqwer Anesthesia Professional Fees, F Dexter, R Epstein, I Bayman, Johannes Ledolter, Anesthesia & Analgesia, vol 116, 2013, 1103–1115
  • Detection of the Onset of Multiple Sclerosis from SD-OCT Thickness Measurements of the Retinal Nerve Fiber Layer, Johannes Ledolter, Randy Kardon, Quality Engineering, vol 25, 2013, 3-10
  • Monitoring changes in individual surgeon’s workloads using anesthesia data, Franklin Dexter, D Masurski, Johannes Ledolter, R Wachtel, B Smallman, M Nussmeier, Canadian Journal of Anesthesia, vol 59, 2012, 571-577
  • Systematic Criteria for Type and Screen Based on Procedure's Probability of Erythrocyte Transfusion, Franklin Dexter, Johannes Ledolter, E Davis, T Witkowski, J Herman, R Epstein, Anesthesiology, vol 116, 2012, 768-778
  • Analysis of Interventions Influencing or Reducing Patient Waiting while Stratifying by Surgical Procedure, Johannes Ledolter, Franklin Dexter, Anesthesia & Analgesia, 2011, 951-957
  • Analysis of Variance of Communication Latencies in Anesthesia: Comparing Means of Multiple Lognormal Distributions, Johannes Ledolter, Franklin Dexter, R H. Epstein, Anesthesia & Analgesia, vol 113, 2011, 888-896
  • Challenges in Constructing Time Series Models from Process Data, Johannes Ledolter, Soren Bisgaard, Quality and Reliability Engineering International, vol 27, 2011, 165-178
  • Importance of appropriately modeling procedure and duration in logistic regression studies of perioperative morbidity and mortality, Franklin Dexter, Elizabeth Dexter, Johannes Ledolter, Anesthesia & Analgesia, vol 113, 2011, 1197-1201
  • Meta-analysis of desflurane and propofol average times and variability in times to extubation and following commands, Ruth E. Wachtel, Franklin Dexter, Richard H. Epstein, Johannes Ledolter, Canadian Journal of Anesthesia, vol 58, 2011, 714-724
  • Hearing a Different Drummer: Evidence of Convergence in European HRM, W. Mayrhofer, C. Brewster, M. Morley, Johannes Ledolter, Human Resource Management Review, vol 21, 2011, 50-67
  • On Model Specification with Closed-Loop Data, Johannes Ledolter, Applied Stochastic Models in Business and Industry, vol 26, 2010, 473-480
  • Analysis of Operating Room Allocations to Optimize Scheduling of Specialty Rotations for Anesthesia Trainees, Frank Dexter, R H. Epstein, R E. Wachtel, Johannes Ledolter, M M. Todd, Anesthesia & Analgesia, vol 111, 2010, 520-524
  • On the Detection of Contemporaneous Relationships among Multiple Time Series, Johannes Ledolter, Communications in Statistics: Simulation and Computation, vol 39, 2010, 137-156
  • Monitoring Patient and Surgeon Waiting to Start Add-On (Urgent) Cases When Fewer Operating Rooms are in Use than Staffed Months in Advance, Johannes Ledolter, F Dexter, R E. Wachtel, Anesthesia & Analgesia, vol 111, 2010, 196-203
  • Addendum to: Wind speed trends over the contiguous USA , S C. Pryor, Johannes Ledolter, Journal of Geophysical Research – Atmospheres, vol 115, 2010
  • Influence of Procedure Classification on Process Variability and Parameter Uncertainty of Surgical Case Durations, Frank Dexter, Elizabeth Dexter, Johannes Ledolter, Anesthesia & Analgesia, vol 110, 2010, 1155-1163
  • Automatic Updating of Times Remaining in Surgical Cases Using Bayesian Analysis of Historical Case Duration Data, Frank Dexter, R H. Epstein, R L. Elgart, J D. Lee, Johannes Ledolter, Anesthesia & Analgesia, vol 108, 2009, 929-940
  • Risk Factors for Serious Injury in Finnish Agriculture, Risto Rautianinen, Johannes Ledolter, K J. Donham , R Ohsfeldt, C Zwerling, American Journal of Industrial Medicine, vol 52, 2009, 419-428
  • Estimation Bias in the First-Order Autoregressive Model and its Impact on Predictions and Prediction Intervals, Johannes Ledolter, Communications in Statistics: Simulation and Computation, vol 38, 2009, 771-787
  • An Experiment to Increase Magazine Sales in a Supermarket, Gordon H. Bell, Johannes Ledolter, Arthur J. Swersey, Interfaces, vol 39, 2009, 145-158
  • A Statistical Analysis of the Lake Levels at Lake Neusiedl, Johannes Ledolter, Austrian Journal of Statistics, vol 37, 2008, 147-160
  • Sensitivity of Super-Efficient Data Envelopment Analysis Results to Individual Decision-Making Units: Example of Surgical Workload by Specialty, Frank Dexter, L Xin, L O'Neil, Johannes Ledolter, Health Care Management Science, vol 11, 2008, 307-318
  • Smoothing Time Series with Local Polynomial Regression on Time, Johannes Ledolter, Communications in Statistics - Theory and Methods, vol 37, 2008, 959-971
  • Comment on the paper “An Overview of the Shainin SystemTM for Quality Improvement,” by Stefan H. Steiner, R. Jock MacKay, and John S. Ramberg, Johannes Ledolter, Quality Engineering, vol 20, 2008, 38-39
  • Increase in Mean Square Forecast Error when Omitting a Needed Covariate, Johannes Ledolter, International Journal of Forecasting, vol 23, 2007, 147-152
  • Random-Coefficient Hidden-Markov Poisson-Regression Models for Inferring a Competitor's Promotion Strategy, Johannes Ledolter, Applied Stochastic Models in Business and Industry, vol 23, 2007, 293-305
  • Estimating Promotion Response when Competitive Promotions are Unobservable, S. Moon, W. A. Kamakura, Johannes Ledolter, Journal of Marketing Research, vol 44, 2007, 503-515
  • Retrospective Ratings of ADHD Symptoms Made at Young Adulthood by Clinic-Referred Boys with ADHD-Related Problems, their Brothers without ADHD, and Control Participants, J. Loney, Johannes Ledolter, J. R. Kramer, R. J. Volpe, Psychological Assessment (American Psychological Association), vol 19, 2007, 269-280
  • Testing 1 - 2 - 3: Experimental Design with Applications in Marketing and Service Operations. (BOOK), Johannes Ledolter, A. J. Swersey, Stanford University Press, 2007
  • Identification of Systematic Under-Estimation (Bias) of Case Durations during Case Scheduling Cannot Markedly Reduce Over-utilized Operating Room Time, F. Dexter, A. Macario, Johannes Ledolter, Journal of Clinical Anesthesia, vol 19, 2007, 198-203

      Sponsored Research

      • Center for the Prevention and Treatment of Visual Loss, Johannes Ledolter. US Department of Veterans Affairs
      • Center for the Prevention and Treatment of Visual Loss, Johannes Ledolter. US Department of Veterans Affairs
      • Center for the Prevention and Treatment of Visual Loss, Johannes Ledolter. US Department of Veterans Affairs

      Other Work

      • Qualität und Produktion (German), Johannes Ledolter, Vienna: UTB-Verlag. In: Praxis der Organisationsanalyse: Anwendungsfelder und Methoden (Mayrhofer, W., Meyer, M., and Titscher, S., editors), 2010, 327-344
      • Pre-control, Johannes Ledolter, Encyclopedia of Statistics in Quality and Reliability, 2008

        Current & Prior Positions

        • Professor of Statistics (part time; summer sessions), Vienna University of Economics and Business Administration, Austria, 2002 - Present
        • Visiting Professor , University of Chicago Booth School of Business, January 2011 - June 2011
        • Professor and Chair, Department of Statistics, Vienna University of Economics and Business Administration, 1997 - 2000
        • Visiting Professor of Statistics, Yale University, August 1994 - July 1995
        • Visiting Associate Professor, Princeton University, August 1985 - July 1986
        • Consultant, Austrian Institute of Economic Research, January 1976 - August 1977
        • Research Scholar, International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria, January 1976 - June 1977

          Professional Affiliations

          • Associate Editor, Statistical Modelling: An International Journal, 2000 - current
          • Associate Editor, Austrian Journal of Statistics, 1997 - current
          • Associate Editor, Journal of Forecasting, 1986 - current
          • Associate Editor, Journal of Business and Economic Statistics, 2012 - 2015
          • Associate Editor, Quality Engineering, 2008 - 2013

          Presentations

          • Combination of Forecasts and Bayesian Prediction Bounds for Operating Room Durations, Even for Procedures with Few or No Historical Data, Frontiers of Statistics and Forecasting , Statistics Sinica, Taipei, Taiwan, December 2013
          • Comments on Statistical Engineering, Stu Hunter Research Conference, Amsterdam, NL, March 2013
          • Detection of the Onset of Multiple Sclerosis from SD-OCT Thickness Measurements of the Retinal Nerve Fiber Layer, ASQ Fall Technical Meeting, American Society for Quality, St. Louis, MO, October 2012
          • Design of Experiments with Applications in Marketing and Service Operations , ENBIS 2010, European Network for Business and Industrial Statistics, Antwerp, Belgium, September 2010

          Committees and Professional Service

          • Statistics and Actuarial Science, 1978-current
          • Promotion and Tenure Committee, 2006-2008
          • NBER/NSF Time Series Analysis Meeting, 2007