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Johannes Ledolter
Professor, Management Sciences and Statistics & Actuarial Science
Robert Thomas Holmes Professor
Contact
319-335-3814
Office
S352 Pappajohn Business Building (PBB)
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 

Reciprocity of Connections in Weighted and Unweighted Networks. Johannes Ledolter, F Dexter, Communications in Statistics: Theory and Methods (forthcoming)

Boston Type 1 Keratoprosthesis: Visual Outcomes, Device Retention, and Complications. K M. Goins, A S. Kitzmann, M A. Greiner, Y H. Kwon, W L. Alward, Johannes Ledolter, M D. Wagoner, Cornea: The Journal of Cornea and External Diseases (forthcoming)

Quantifying the Diversity and Similarity of Surgical Procedures among Hospitals and Anesthesia Providers. F Dexter, Johannes Ledolter, B Hindman, Anesthesia & Analgesia, 2016, vol 122, 251-263

Large Heterogeneity in Mean Durations of Labor Analgesia among Hospitals Reporting to the American Society of Anesthesiologist’s Anesthesia Quality Institute. P Flood, F Dexter, Johannes Ledolter, R Dutton, Anesthesia & Analgesia, 2015, vol 121, 1283-1289

Bernoulli Cumulative Sum (CUSUM) Control Charts for Monitoring of Anesthesiologists’ Performance in Supervising Anesthesia Residents and Nurse Anesthetists. F Dexter, Johannes Ledolter, B Hindman, Anesthesia & Analgesia, 2014, vol 119, 679-685

Influence of provider type (nurse anesthetist or resident physician), staff assignments, and other covariates on daily evaluations of anesthesiologists' quality of supervision. F Dexter, Johannes Ledolter, T Smith, D Griffiths, B Hindman, Anesthesia & Analgesia, 2014, vol 119, 670-678

George Box’s Contributions to Time Series Analysis and Forecasting. Greta Ljung, Johannes Ledolter, Bovas Abraham, Applied Stochastic Models in Business and Industry, 2014, vol 30, 25-36

Forecasting State Unemployment Rates: A Robust Clustering Approach. Y Wang, R S. Tsay, Johannes Ledolter, K M. Shrestha, Journal of Forecasting, 2013, vol 32, 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, 2013, vol 2, 1-9

Economic Field Experiments: Comments on Design Efficiency, Sample Size and Statistical Power. Johannes Ledolter, Journal of Economics and Management, 2013, vol 9, 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, 2013, vol 117, 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, 2013, vol 116, 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, 2013, vol 25, 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, 2012, vol 59, 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, 2012, vol 116, 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, 2011, vol 113, 888-896

Challenges in Constructing Time Series Models from Process Data. Johannes Ledolter, Soren Bisgaard, Quality and Reliability Engineering International, 2011, vol 27, 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, 2011, vol 113, 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, 2011, vol 58, 714-724

Hearing a Different Drummer: Evidence of Convergence in European HRM. W. Mayrhofer, C. Brewster, M. Morley, Johannes Ledolter, Human Resource Management Review, 2011, vol 21, 50-67

On Model Specification with Closed-Loop Data. Johannes Ledolter, Applied Stochastic Models in Business and Industry, 2010, vol 26, 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, 2010, vol 111, 520-524

On the Detection of Contemporaneous Relationships among Multiple Time Series. Johannes Ledolter, Communications in Statistics: Simulation and Computation, 2010, vol 39, 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, 2010, vol 111, 196-203

Addendum to: Wind speed trends over the contiguous USA. S C. Pryor, Johannes Ledolter, Journal of Geophysical Research – Atmospheres, 2010, vol 115

Influence of Procedure Classification on Process Variability and Parameter Uncertainty of Surgical Case Durations. Frank Dexter, Elizabeth Dexter, Johannes Ledolter, Anesthesia & Analgesia, 2010, vol 110, 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, 2009, vol 108, 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, 2009, vol 52, 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, 2009, vol 38, 771-787

An Experiment to Increase Magazine Sales in a Supermarket. Gordon H. Bell, Johannes Ledolter, Arthur J. Swersey, Interfaces, 2009, vol 39, 145-158

A Statistical Analysis of the Lake Levels at Lake Neusiedl. Johannes Ledolter, Austrian Journal of Statistics, 2008, vol 37, 147-160

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, 2008, vol 20, 38-39

Increase in Mean Square Forecast Error when Omitting a Needed Covariate. Johannes Ledolter, International Journal of Forecasting, 2007, vol 23, 147-152

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

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 and prior positions 
Complimentary Appointment, Department of Statistics and Actuarial Science, College of Liberal Arts and Sciences, The University of Iowa, Iowa City, IA, August 2000 - Present
Professor of Statistics, Vienna University of Economics and Business Administration, Austria, 2002 - August 2015
Visiting Professor, Stanford University, June 2014 - August 2014
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
Review and editorial work 

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, August 2012 - August 2015

Associate Editor, Quality Engineering, 2008 - 2013

Presentations 

Data mining and business analytics with an Application to Forecasting State Unemployment Rates. National Research University-Higher School of Economics, Moscow, Russia, June 2015

Data mining and business analytics. University of Northern Iowa , Cedar Falls, April 2015

Data mining and business analytics: Statistical models. Peking University, Beijing, China, March 2015

George Box’s contributions to time series analysis and forecasting. Department of Statistics, University of Linz, Linz, Austria, May 2014

Data mining and business analytics with big and small data – it is not always size that matters. ASA Milwaukee Chapter, Milwaukee, WI, April 2014

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 , 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, St. Louis, MO, October 2012

Design of Experiments with Applications in Marketing and Service Operations. ENBIS 2010, Antwerp, Belgium, September 2010

Committees and professional service 
Statistics and Actuarial Science, 1978 - Current
Dean's Advisory Committee, 2015 - 2016
Promotion and Tenure Committee, 2014 - 2016
NBER/NSF Seminar on Time Series Analysis, 2014 - 2015
Committee on Research, 2014 - 2015
Promotion and Tenure Committee, 2006 - 2008
NBER/NSF Time Series Analysis Meeting, 2007