Professor Shaun Wulff

Department of Mathematics and Statistics

Professor of Statistics

Contact Information

(307) 766-6483wulff@uwyo.edu

Ross Hall 336

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Education

B.S. Montana State University 1991; Political Science
M.S. Montana State University 1994; Statistics
Ph.D. Oregon State University 1999; Statistics

Representative Publications

  1. Lai M., Wulff S.S., Cao Y., Robinson T.J., Rajapaksha R. (2023). An Interpretable Time Series Machine Learning Method for Varying Forecast and Nowcast Lengths in Wastewater-Based Epidemiology. MethodsX, 897, 11, 1-11, DOI: 10.1016/j.mex.2023.102382
  2. Oluwatuyi O., Ng K., Wulff S.S. (2023). Improved Resistance Prediction and Reliability for Bridge Pile Foundation in Shales Through Optimal Site Investigation Plans. Reliability Engineering and System Safety, 239,  11, 1-12. DOI: 10.1016/j.ress.2023.109476
  3. Lai M, Cao Y, Wulff S.S., Robinson T.J., McGuire A., Bisha B. (2023). A Time Series Based Machine Learning Strategy for Wastewater Based Forecasting and Nowcasting of COVID-19 Dynamics. Science of the Total Environment. 897, 1-11. DOI doi.org/10.1016/j.scitotenv.2023.165105
  4. Buchanan C.B., Wulff S.S., Albeke S.E., Beck J.L. (2023). Elk Shift Resource Selection Temporally in Response to Natural Gas Development. Rangeland Ecology & Management. 90, 35-44. DOI: 10.1016/j.rama.2023.05.006
  5. Oluwatuyi O., Ng K., Wulff, S.S., Rajapakshage R. (2023). Optimal Site Investigation for Bridge Foundation Design through a Combined Analysis of Geological and Property Uncertainties. Geotechnical and Geological Engineering, 41, 2377-2389. DOI: 10.1007/s10706-023-02403-x
  6. Oluwatuyi O., Rajapakshage R., Wulff S.S., Ng K. (2023). Proposed Hybrid Approach for Three-Dimensional Subsurface Simulation to Improve Boundary Determination and Design of Optimum Site Investigation Plan for Pile Foundations. Soils and Foundations. 63, 1, 1-13. DOI: 10.1016/j.sandf.2022.101269
  7. Gaweesh S.M., Ahmed I.U., Ahmed M. M., Wulff S.S. (2023). Developing Statewide Safety Performance. Functions for Commercial Trucks Transporting Hazardous Materials on Interstate Rural Roads in Wyoming. Transportation Research Record: Journal of the Transportation Research Board, 2677, 1, 943-958. DOI 10.1177/03611981221103231
  8. Das A., Khan M.N., Ahmed M.M., Wulff S.S. (2022). Cluster Analysis and Multi-Level Modeling for Evaluating the Impact of Rain on Aggressive Lane-Changing Characteristics Utilizing Naturalistic Driving Data. Journal of Transportation Safety and Security, 14, 12, 2137-2165. DOI 10.1080/19439962.2022.2069896
  9. Oluwatuyi O., Holt R., Rajapakshage R., Wulff S.S., Ng K. (2022). Inherent Variability Assessment from Sparse Property Data of Overburden Soils and Intermediate Geomaterials using Random Field Approaches. Georisk, 16, 4, 766-781. DOI: 10.1080/17499518.2022.2046783
  10. Adhikari P., Ng K., Gebreslasie Y.Z., Wulff S.S. (2022). New Static Analysis Methods and LRFD Recommendations for Steel H-piles in Rock-Based Intermediate Geomaterials. Geotechnical and Geological Engineering, 40, 2553-2567. DOI: 10.1007/s10706-021-02045-x
  11. Khan M.N., Das A., Ahmed M.M., Wulff S.S. (2021). Multilevel Weather Detection Based on Images: A Machine Learning Approach with Histogram of Oriented Gradient and Local Binary Pattern-Based Features. Journal of Intelligent Transportation Systems: Technology, Planning, and Operations, 25, 5, 513-532. DOI: 10.1080/15472450.2021.1944860
  12. Shang J., Robinson T.J., Wulff S.S. (2021). Goodness-of-Fit Tests in Logistic Regression with Continuous Covariates. Journal of Modern and Applied Statistical Methods, 20, 2, 1-21. DOI: 10.56801/Jmasm.V20.i2.3
  13. Rezapour M. M., Wulff S.S., Ksaibati K. (2021). Bayesian Hierarchical Modeling of Traffic Barrier Crash Severity, A New Strategy for Barrier Design. International Journal of Injury Control and Safety Promotion, 28, 1, 94-102. DOI: 10.1080/17457300.2020.1849312
  14. Rezapour M. M., Molan A.M., Wulff S.S., Ksaibati K. (2021). Application of Bayesian Ordinal Logistic Model for Identification of Factors to Traffic Barrier Crashes: Considering Roadway Classification. Transportation Letters: The International Journal of Transportation Research, 13, 4, 308-314. DOI: 10.1080/19427867.2020.1728041               
  15. Rezapour M.M., Wulff S.S., Ksaibati K. (2021). A Comprehensive Sequential Strategy for Structural Equation Modeling of Traffic Barrier Crashes. Journal of Transportation Safety and Security, 13, 11, 1215-1239. DOI: 10.1080/19439962.2020.1716908.
  16. Adhikari P., Gebreslasie Y.Z., Ng K., Wulff S.S. (2020). Static and Economic Analyses of Driven Piles in IGM using the Wyopile Database. Journal of Bridge Engineering, 25, 5, 1-15. DOI: 10.1061/(ASCE)BE.1943-5592.0001546 
  17. Wulff S.S., Cao Y., Robinson T.J. (2020). DP Pareto Optimal Balanced Orthogonal Subplot Designs. Qualitative Technology and Quantitative Management, 17, 4, 486-500. DOI: 10.1080/16843703.2019.1683930.
  18.  Adhikari P., Ng K., Gebreslasie Y.Z., Wulff S.S., Sullivan T.A. (2020). Geomaterial Classification Criteria for Design and Construction of Driven Steel H-Piles. Canadian Geotechnical Journal, 57, 4, 616-621.  DOI: 10.1139/cgj-2018-0786 
  19. Robinson T.J., Wulff S.S., Webb M., Banda J.A., Nair S. (2019). Assessing the Efficacy of Environmental Restoration via Non-Inferiority: A Bayesian Perspective. Quality and Reliability Engineering International, 35, 1436-1444. DOI: 10.1002/qre.2535
  20. Rezapour M.M., Wulff S.S, Ksaibati K. (2019). Examination of the Severity of Two-Lane Traffic Barrier Crashes Using the Mixed Logit Model. Journal of Safety Research, 70, 223-232. DOI: 10.1016/j.jsr.2019.07.010.
  21. Moomen M., Rezapour M., Raja M., Wulff S.S., Ksaibati K. (2019). Evaluating the Safety Effectiveness of Advance Downgrade Warning Signs in Preventing Downgrade Truck Crashes Using a Propensity Scores Framework. Transportation Research Record: Journal of the Transportation Research Board, 2673, 7, 673-683. DOI: 10.1177/0361198119847988
  22. Ahmed M., Ali E., Wulff S.S. (2019). Detection of Critical Safety Events on Freeways in Clear and Rainy Weather using SHRP2 Naturalistic Driving Dataset using Parametric and Non-Parametric Techniques. Safety Science, 119, 141-149. DOI: 10.1016/j.ssci.2019.01.007
  23. Yin T., Wulff S.S., Pierre J.W., Robinson T.J. (2019). A Case Study on the Use of Data Mining for Detecting and Classifying Abnormal Power System Modal Behaviors. Quality Engineering, 31, 2, 314-333. DOI: 10.1080/08982112.2018.1530356
  24. Li J., Wulff S.S. (2018). Bayesian Diagnostic Checking of the Capital Asset Pricing Model. Journal of Applied Mathematics and Physics, 6, 321-337. DOI: 10.4236/jamp.2018.62031
  25. Dingess P.M., Darling R.A., Derman R.C., Wulff S.S., Hunter M.L., Ferrario C.R., Brown T.E. (2017). Structural and Functional Plasticity within the Nucleus Accumbens and Prefrontal Cortex Associated with Time-Dependent Increases in Food Cue Seeking Behavior. Neuropsychopharmacology, 42, 2354-2364. DOI: 10.1038/npp.2017.57.
  26. Cao Y., Wulff S.S., Robinson T.J. (2017). DP-Optimality in Terms of Multiple Criteria and its Application to the Split-Plot Design. Journal of Quality Technology, 49, 1, 27-45. QICID. 39459.
  27. Shinstine D.S., Wulff S.S., Ksaibati K. (2016). Factors Associated with Crash Severity on Rural Roadways in Wyoming. Journal of Traffic and Transportation Engineering, 3, 4, 308-323. DOI: 10.1016/j.jtte.2015.12.002.
  28. Baniani A.M., Nargesi Z.R., Moghadam A.M., Wulff S.S. (2015). Split-Block Split-Plot Experimental Design to Assess Corrosion in Medium Carbon Steel. Quality Engineering, 27, 2, 212-229. DOI: 10.1080/08982112.2014.957401.
  29. Ardakani M.K., Wulff S.S. (2014). An Extended Problem to Bertrand’s Paradox. Discussiones Mathematicae Probability and Statistics, 34, 1-2, 23-34. DOI: 10.7151/dmps.1160.
  30.  Wulff S.S., Robinson T.J. (2014). What is the Probability You Are a Bayesian? Journal of Statistics Education, 22, 2, 1-23. DOI: 10.1080/10691898.2014.11889706
  31. Ardakani M.K., Wulff S.S. (2013). An Overview of Optimization Formulations for Multi-Response Surface Problems. Quality and Reliability Engineering International, 29, 1, 3-16. DOI: 10.1002/qre.1288.
  32. Toh-Boyo G.M., Wulff S.S., Basile F. (2012). Comparison of Sample Preparation Methods and Evaluation of Intra and Inter Sample Reproducibility in Bacteria MALDI-MS Profiling. Analytical Chemistry, 84, 22, 9971-9980. DOI: 10.1021/ac302375e.
  33. Das D., Robinson T.J., Myers W.R., Wulff S.S. (2011). Optimal Screening Designs for Robust Parameter Design. Journal of Statistical Theory and Applications, 10, 2, 279-304. 
  34. Kim H.D., Wulff S.S., Robinson T.J., (2011). Smoothing Parameter Selection in Model Robust Regression. Journal of Statistical Theory and Applications, 10, 2, 323-346. 
  35.  Ardakani M.K., Das D., Wulff S.S., Robinson T.J. (2011). Estimation in Second-order Models with Errors in the Factor Levels. Communications in Statistics: Theory and Methods, 40, 9, 1573-1590. DOI: 10.1080/03610921003637421.
  36. Wulff S.S. (2009). Evaluation of the Mixed Linear Model with Orthogonalized and Studentized Residuals. Journal of Statistical Theory and Practice, 3, 2, 463-476. DOI: 10.1080/15598608.2009.10411938.
  37. Wulff S.S, Robinson T.J. (2009). Assessing the Uncertainty of Regression Estimates in a Response Surface Model for Repeated Measures. Quality Technology and Quantitative Management, 6, 3, 309-324. DOI: 10.1080/16843703.2009.11673202.
  38. Soukup T.L., Aziz O.A., Tootle G.A., Piechota T.C., Wulff S.S. (2009). Long Lead-Time Streamflow Forecasting of the North Platte River Incorporating Oceanic-Atmospheric Climate Variability. Journal of Hydrology, 368, 131-142. DOI: 10.1016/j.jhydrol.2008.11.047.
  39. Wulff S.S. (2008). The Equality of REML and ANOVA Estimators of Variance Components in Unbalanced Normal Classification Models. Statistics and Probability Letters, 78, 4, 405-411. DOI: 10.1016/j.spl.2007.07.013.
  40. Kim H.D., Robinson T.J., Wulff S.S., Parker P.A. (2007). Comparison of Parametric, Nonparametric and Semi-Parametric Modeling of Wind Tunnel Data. Quality Engineering, 19, 3, 179-190. DOI: 10.1080/08982110701438485.
  41. Leismeister C., Pochop L., Kerr G., Wulff S.S., Johnson, D. (2007). Evaluating the Catch-Can Test for Measuring Lawn Sprinkler Application Rates. Journal of the American Water Resources Association, 43, 4, 938-946. DOI: 10.1111/j.1752-1688.2007.00075.x.
  42. Wulff S.S., Birkes D. (2005). Best Unbiased Estimation of Fixed Effects in Mixed ANOVA Models. Journal of Statistical Planning and Inference, 34, 3, 305-313. DOI: 10.1016/j.jspi.2004.01.014.
  43. Wulff S.S. (2005). Best Unbiased Estimation in Unbalanced Split Plot Designs. Communications in Statistics: Theory and Methods, 34, 3, 631-649. DOI: 10.1081/STA-200052098.
  44. Wulff S.S. Birkes D. (2005). Minimum Variance Unbiased Translation Invariant Estimation of Variance Components under Normality. Statistics, 39, 1, 53-65. DOI: 10.1080/02331880412331328279.
  45. Wulff S.S., Weitz M. (2005). Measurement Uncertainty in the Calibration of Low Flow Ambient Air Samplers. Quality and Reliability Engineering International, 21, 6, 605-619. DOI: 10.1002/qre.678.
  46. Birkes D., Wulff S.S. (2003). Existence of Maximum Likelihood Estimates in Normal Variance-Components Models. Journal of Statistical Planning and Inference, 113, 1, 35-47. DOI: 10.1016/S0378-3758(01)00302-0.