Roy Welsch - Faculty | MIT Sloan School of Management
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Faculty & Research

Roy Welsch

  • Eastman Kodak Leaders for Global Operations Professor of Management
  • Professor of Statistics and Engineering Systems

Roy E. Welsch is the Eastman Kodak Leaders for Global Operations Professor of Management and a Professor of Statistics and Data Science at the MIT Sloan School of Management and the MIT Center for Statistics and Data Science. He is the Director of the MIT Center for Computational Research in Economics and Management Science.

Welsch joined the MIT faculty in 1969 as an assistant professor, became an associate professor four years later, and was promoted to professor in 1979. He held the Leaders for Manufacturing (now Leaders for Global Operations) chair from 1988 until 1993. From 1973 until 1979, he was also a Senior Research Associate at the National Bureau of Economic Research, where he participated in the development of the Troll econometric, financial, and statistical modeling system. He was co-director or director of the MIT Statistics Center from 1981 until 1989.

Welsch is widely recognized for his book, Regression Diagnostics: Identifying Influential Data and Sources of Collinearity, (with Edwin Kuh and David Belsley) on regression diagnostics and for his work on robust estimation, multiple comparison procedures, nonlinear modeling, and statistical computing. He is currently involved with research on robust process control and experimental design, credit-scoring models and risk assessment, diagnostics for checking model and design assumptions, volatility modeling in financial markets, uncertainty quantification in plots and images, and repurposing existing drugs or combinations of drugs to prevent or delay Alzheimer's disease by creating synthetic clinical trials based on electronic health records. Welsch teaches Data Analysis and Applied Statistics, focusing on regression modeling, experimental design, and quality control with financial and marketing applications. He is a Fellow of the Institute of Mathematical Statistics, the American Statistical Association, and the American Association for the Advancement of Science.

Welsch holds an AB in mathematics from Princeton University as well as an MS and a PhD in mathematics from Stanford University.

  • "Distinguishing Between Facts and Opinions: Survey and Challenges." Chaturvedi, Iti, Erik Cambria, and Roy E. Welsch. Artificial Intelligence Review. Forthcoming.
  • "Heterogeneous Characters Modeling of IM services Users’ Online Behavior." Cui, H., R. Li, Y. Fang, B. Horn, and R. Welsch. PlosOne. Forthcoming.
  • "Natural Language Based Financial Forecasting: A Survey." Xing, Frank Z., Erik Cambria, and Roy Welsch. Artificial Intelligence Review. Forthcoming.
  • "Robust Dependence Modeling for High-Dimensional Covariance Matrices with Financial Applications." Zhu, Zhe, and Roy Welsch. The Annals of Applied Statistics. Forthcoming.
  • "The Key Techniques and Future Vision of Feature Selection in Machine Learning." Cui, H., S. Xu, L. Zhang, Roy Welsch, and B. Horn. Journal of Beijing University of Posts and Telecommunications. Forthcoming.
  • "An Advanced Classification Model for a Fibrosis Grading System Using a Machine Learning Based Algorithm." Yang, Y., H. Yu, and Roy Welsch, Working Paper. 2017.
  • "An Artificial Neuron Network Based Algorithm as a Superior Computational Tool for Liver Fibrosis Assessment Using Second Harmonic Generation Microscopy." Yu, Y., J. Wang, C. Ng, Y. Ma, S. Mo, E. Fong, J. Xing, Z. Song, Y. Xie, K. Si, A. Wee, R. Welsch, P. So, and H. Yu, Working Paper. 2017.
  • "Deep Genetic Programming for Cross-Domain and Cross-Language Sentiment Analysis." Chaturvedi, Iti, Erik Cambria, and Roy Welsch, Working Paper. 2017.
  • "Growing Semantic Vines for Robust Asset Allocation." Xing, F., Erik Cambria, and Roy Welsch, Working Paper. 2017.
  • "Intelligent Bayesian Asset Allocation via Market Sentiment Views." Xing, F., Erik Cambria, and Roy Welsch, Working Paper. 2017.
  • "Kernel Dependence Analysis and Graph Structure Morphing for Novelty Detection with High-dimensional Small Size Datasets." Mohammadi-Ghazi, Reza, Roy Welsch, and Oral Büyüköztürk, Working Paper. 2017.
  • "Modeling Chronic Kidney Disease based on Machine Learning Using Bioinformatics Records." Cui, H., S. Xu, Y. Fang, R. Welsch, and C. Zhang, Working Paper. 2017.
  • "Prediction of User Activity Level in Communication Networks." Cui, H., L. Hu, G. Wu, Y. Fang, and R. Welsch, Working Paper. 2017.
  • "Quantitative Real-time Monitoring of Rat Hepatocyte Isolation." Ng, C., H. Yu, and Roy Welsch, Working Paper. 2017.
  • "Robust Instantaneous Binary Partition Based on Clustering with Bagging and Seeding." Xie, W., and Roy Welsch, Working Paper. 2017.
  • "Service Correlation Analysis of Mobile Users Based on HSMM." Cui, H., S. Liu, Z. Yu, Y. Fang, Z. Xia, and R. Welsch, Working Paper. 2017.
  • "Shipment Policies for Perishable Products in Two-tier Supply Chains." Akkas, A., D. Simchi-Levi, V. Gaur, and Roy Welsch, Working Paper. 2017.
  • "Three Kinds of Models on the Distribution Trend of Data Services." Cui, H., X. Chen, R. Li, Y. Fang, L. Zeng, and R. Welsch, Working Paper. 2017.
  • "Comprehensive Predictions of Tourists' Next Visit Location Based on Call Detail Records Using Machine Learning and Deep Learning Methods." Nai Chun Chen, Wanquin Xie, Roy E. Welsch, Kent Larson, and Jenny Xie. In Proceedings of the 2017 IEEE International Congress on Big Data, Honolulu, HI: June 2017.
  • "sqFibrosis: A Fully Quantitative Classification Method to Facilitate Fibrosis Scoring Using Collagen Stains." Yu, Yang, Hanry Yu, and Roy Welsch, Working Paper. 2017.
  • "A Data-Mining Approach for Acoustic Diagnosis of Cardiopulmonary Disease." Flietstra, Bryan, Natasha Markuzon, and Roy E. Welsch, Working Paper. 2017.
  • "Modeling Optimal Strategic Decisions in Football." McCord, C., and Roy E. Welsch, Working Paper. 2017.
  • "Performance Analysis under different parameters and wavelets of a Simple-Ring Echo State Network." Cui, H., C. Feng, Y. Fang, Y. Liu, and R. Welsch, Working Paper. 2017.
  • "Predicting Mortality in Critical Care Using Time-Varying Parameters and the Univariate Flagging Algorithm." Sheth, Mallory, Roy E. Welsch, Roger Mark, and Natasha Markuzon, Working Paper. 2017.
  • "Learning Word Dependencies in Text by Means of a Deep Recurrent Belief Network." Chaturvedi, Iti, Yew-Soon Ong, Ivor W. Tsang, Roy Welsch, and Erik Cambria. Knowledge Based Systems Vol. 108, (2016): 144–154.
  • "A Method to Quantify Co-localization in biological images." Shiwen Zhu, Roy Welsch, and Paul T. Matsudaira. In Proceedings of the 38th Annual International Conference of the IEEE Engineering and Biology Society (EMBC), Orlando, FL: August 2016.
  • "Abundant Copy-Number Loss of CYCLOPS and STOP Genes in Gastric Adenocarcinoma." Catcutache, Ioana, Alice Yinting Wu, Yuka Suzuki, John Richard McPherson, Zhengdeng Lei, Niantao Deng, Shenli Zhang, Wai Keong Wong, Khee Chee Soo, Weng Hoong Chan, London Lucien Ooi, Roy Welsch, Patrick Tan, and Steven G. Rozen. Springer International Publishing Vol. 19, No. 2 (2016): 453-465.
  • "The Univariate Flagging Algorithm (UFA): A Fully-Automated Approach for Identifying Optimal Thresholds in Data." Sheth, Mallory, Roy E. Welsch, and Natasha Markuzon, Working Paper. 2016.
  • "Anomaly Detection via a Gaussian Mixture Model for Flight Operation and Safety Monitoring." Li, Lishuai, R. John Hansman, Rafael Palacios, and Roy Welsch. Transportation Research Part C: Emerging Technologies Vol. 64, (2016): 45-47.
  • "Descriptors of Oxygen-Evolution Activity for Oxides: A Statistical Evaluation." Hong, Wesley T., Roy E. Welsch, and Yang Shao-Horn. The Journal of Physical Chemistry C Vol. 120, No. 1 (2016): 78-86.
  • "Applying Machine Learning to Comprehensive Predictions of Tourists’ Next Location Based on Call Detail Records." Chen, Nai Chun, Wanqin Xie, Roy E. Welsch, Kent Larson, and Jenny Xie, Working Paper. 2016.
  • "Heterogeneous Characters Modeling of IM services Users’ Online Behavior." ​Cui, H., R. Li, and R. Welsch, Working Paper. 2017.
  • "Differential remodeling of extra-cellular matrices by breast cancer initiating cells." Raja, Anju, S. Xu, D. Tai, W. Sun, P. So, Roy E. Welsch, C. Chen and H. Yu. Journal of Biophotonics Vol. 8, No. 10 (2015): 804-815.
  • "Comments on: Robust Estimation of Multivariate Location and Scatter in the Presence of Cellwise and Casewise Contamination." Agostinelli, Claudio, Andy Leung, Victor J. Yohai, and Ruben H. Zamar. TEST Vol. 24, No. 3 (2015): 482-483.
  • "Leadership and Scholarship: Conflict or Synergy?" Welsch, Roy E. In Leadership and Women in Statistics, edited by A. Golbeck, I. Olkin, Y. Gel, 365-370. Boca Raton, FL: Chapman and Hall, 2015.
  • "Statistical Evaluation of the Causal Mechanisms Associated with Astronaut Shoulder Injury in Space Suits." Anderson, Allison, Dava J. Newman, and Roy E. Welsch. Aerospace Medicine and Human Performance Vol. 86 , No. 7 (2015): 606-613.
  • "Multistrata Subsurface Laser-Modified Microstructure With Backgrind-Assisted Controlled Fracture for Defect-Free Ultrathin Die Fabrication." Teh, Weng-Hong, Duane S. Boning and Roy Welsch. IEEE Transactions on Components, Packaging and Manufacturing Technology Vol. 5, No. 7 (2015): 1006-1018.
  • "Quantification of Liver Fibrosis Via Second Harmonic Imaging of the Glisson’s Capsule from Liver Surface." Xu, Shuoyu, Chiang Huen Kang, Xiaoli Gou, Qiwen Peng, Jie Yan, Shuangmu Zhuo, Chee Leong Cheng, Yuting He, Yuzhan Kang, Wuzheng Xia, Peter T C So, Roy Welsch, Jagath C Rajapakse, and Hanry Yu. Journal of Biophotonics Vol. 9, No. 4 (2015): 351-363.
  • "Multi-strata Stealth Dicing Before Grinding for Singulation-defects Elimination and Die Strength Enhancement: Experiment and Simulation." Teh, Wang H., Duane S. Boning, and Roy E. Welsch. IEEE Transactions on Semiconductor Manufacturing Vol. 28, No. 3 (2015): 408 - 423.
  • "Multi-Strata Subsurface Laser Die Singulation to Enable Defect-Free Ultra-Thin Stacked Memory Dies." Teh, Weng H., Duane S. Boning, and Roy E. Welsch. AIP Advances Vol. 5, No. 5 (2015): 1-7.
  • "Statistical Learning for Variable Annuity Policyholder Withdrawal Behavior." Zhu, Zhe, and Roy E. Welsch. Applied Stochastic Models in Business and Industry Vol. 31, No. 2 (2015): 137-147.
  • "qFibrosis: A Fully Quantitative Innovative Method Incorporating Histological Features to Facilitate Sccurate Fibrosis Scoring in Animal Model and Chronic Hepatitis B Patients." Xu, Shuoyu, Y. Wang, D. Tai, S. Wang, C. Cheng, Q. Peng, J. Yan, Y. Chen, J. Sun, X. Liang , Y. Zhu, J. Rajapakse, Roy E. Welsch, P. So, A. Wee, J. Hou and H. Yu. Journal of Hepatology Vol. 61, No. 2 (2014): 260-269.
  • "Experimenting Liver Fibrosis Diagnostic by Two Photon Excitation Microscopy and Bag-Of features Image Classification." Stanciu, Stefan, S. Xu, Q. Peng, J. Yan, G. Stanciu, Roy E. Welsch, P. So, G. Csucs and H. Yu. Scientific Reports Vol. 4, No. 4636 (2014): 1-62.
  • "Logistics Agglomeration in the US." Rivera, Liliana, Y. Sheffi and Roy E. Welsch. Transportation Research Part A: Policy and Practice Vol. 59, (2014): 222-238.
  • "Measuring the Distance Between Images and Image Uncertainty Using Wavelet Decompositions and the Earth Mover’s Distance." Yunfan Tang, and Roy E. Welsch. In Proceedings of the International Statistical Institute World Statistics Congress, edited by Murray Cameron, Hong Kong, China: August 2013.
  • "Image Analysis for Cellular and Tissue Engineering." Xu, Shuoyu, P. Mundra, H. Li, S. Zhu, Roy E. Welsch and J. Rajapakse. In Imaging in Cellular and Tissue Engineering, edited by H. Yu, 223-246. Boca Raton, FL: Taylor and Francis, 2013.
  • "Inferring Time Delayed Gene Regulatory Networks Using Crosscorrelation and Sparse Regression." Piyushkumar Mundra, Jie Zheng, Mahesan Niranjan, Roy E. Welsch and Jagath Rajapakse. In Bioinformatics Research and Applications, edited by Daniel Janies, Daniel Schwartz, Oliver Eulenstein, Zhipeng Cai, Berlin, Germany: May 2013.
  • "Neutrophils Infected with Highly Virulent Influenza H3N2 Virus Exhibit Augmented Early Cell Death and Rapid Induction of Type I Interferon Signaling Pathways." Ivan, Fransiskus X., K.S. Tan, M.C. Phoon, Bevin P. Engelward, Roy E. Welsch, Jagath C. Rajapakse and Vincent T. Chow. Genomics Vol. 101, No. 2 (2013): 101-112.
  • "Bootstrapping of Short Time-Series Multivariate Gene-Expression Data." P. Mundra, J. C. Rajapakse and Roy E. Welsch. In Proceedings of COMPSTAT 2012, edited by A. Colubi, The Hague, The Netherlands: August 2012.
  • "Differential Pulmonary Transcriptomic Profiles in Murine Lungs Infected with Low and Highly Virulent Influenza H3N2 Viruses Reveal Dysregulation of TERM1 Signaling, Cytokines, and Chemokines." Ivan, Fransiskus X., Jagath C. Rajapakse, Roy E. Welsch, Steve G. Rozen, T. Narasaraju, Gordon M. Xiong, Bevin P. Engelward and Vincent T. Chow. Functional and Integrative Genomics Vol. 12, No. 1 (2012): 105-117.
  • "Correlation of Cell Membrane Dynamics and Cell Motility." Veronika, Merlin, Roy E. Welsch, P. Matsudaira and J. Rajapakse. BMC Bioinformatics Vol. 12, No. Suppl. 13 (2011): S19.
  • "Outlier Detection for Covariance Estimation via Feature Selection Algorithms." Rajiv Menjoge and Roy E. Welsch. In Proceedings of the 58th International Statistical Institute World Statistics Congress, edited by Murray Cameron, Dublin, Ireland: November 2011.
  • "Predicting in vivo Anti-Heptatofribrotic Drug Efficacy Based on in vitro High-Content Analysis." Zheng, Baixue, Looling Tan , Xuejun Mo , Weimiao Yu , Yan Wang , Lisa Tucker-Kellogg , Roy E. Welsch , Peter T. C. So and Hanry Yu. PLoS ONE Vol. 6, No. 11 (2011): e26230.
  • "Automatic Scoring of Liver Fibrosis through Combined Features from Different Collagen Group." S. Xu, D. Tai, A. Wee, Roy E. Welsch, P. So, H. Yu and J. Rajapakse. In Proceedings of the 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC’ 11), New York, NY: August 2011.
  • "Estimation of the population of Neutrophils Induced to Differentiate from the MPRO Mouse Promyelocytic Cell Line." F. Ivan, Roy E. Welsch, V. Chow and J. Rajapakse. In Proceedings of the 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, New York, NY: August 2011.
  • "MCAM: Multiple Clustering Analysis Methodology for Deriving Hypotheses and Insights From High-Throughput Proteomic Datasets." Naegle, Kristen M., Roy E. Welsch, Michael B. Yaffe, Forest M. White and Douglas A. Lauffenburger. PLoS Computational Biolog Vol. 7, No. 7 (2011): 1-15.
  • "A Diagnostic Method for Simultaneous Feature Selection and Outlier Identification in Linear Regression." Menjoge, Rajiv and Roy E. Welsch. Computational Statistics and Data Analysis Vol. 54, No. 12 (2010): 3181-3193.
  • "Outlier Detection and Robust Covariance Estimation Using Mathematical Programming." Nguyen, Tri-Dung and Roy E. Welsch. Advances in Data Analysis and Classification Vol. 4, No. 4 (2010): 301-334.
  • "Robust Regression Using Semi-Definite Programming." Welsch, Roy E. and Tri-Dung Nguyen. Computational Statistics and Data Analysis Vol. 54, (2010): 3212-3226.
  • "PTMSCOUT: A Web Resource for Analysis of High-throughput Post-translational Proteomic Studies." Naegle, Kristen M., Melissa Gymrek, Brian A. Joughin, Joel P. Wagner, Roy E. Welsch, Michael B. Yaffe, Douglas A. Lauffenburger and Forest M. White. Molecular and Cellular Proteomics Vol. 9, No. 11 (2010): 2558-2570.
  • "Quantification of Cytoskeletal Protein Localization from High Content Images." Shiwen Zhu, Paul Matsudaira, Roy E. Welsch and Jagath C. Rajapakse. In Proceedings of 5th IAPR International Conference on Pattern Recognition in Bioinformatics (PRIB 2010), edited by Elena Marchiori, Evgeni Tsivtsivadze, Tjeerd M. H. Dijkstra, Tom Heskes, Nijmegen, The Netherlands: November 2010.
  • "Toward Surface Quantification of Liver Fibrosis Progression." He, Yuting, Chiang Huen Kang, Shuoyu Xu, Xiaoye Tuo, Scott Trasti, Dean C S Tai, Anju Mythreyi Raja, Qiwen Peng, Peter T C So, Jagath C Rajapakse, Roy E. Welsch and Hanry Yu. Journal of Biomedical Optics Vol. 15, No. 5 (2010): 1-11.
  • "A Cell Profiling Framework for Modeling Drug Responses from HCS Imaging." Ng, Alvin Y. J., Jagath C. Rajapakse, Roy E. Welsch, Paul T. Matsudaira, Victor Horodincu and James G. Evans. Journal of Biomolecular Screening Vol. 15, No. 7 (2010): 858-868.
  • "Visualizing the Sampling Variability of Plots." Roy E. Welsch and R. Menjoge. In Proceedings of COMPSTAT 2010, edited by G. Saporta, Y. Lechevallier, Heidelberg, Germany: August 2010.
  • "Sub-Population Analysis Based on Temporal Features of High Content Images." Veronika, Merlin, James Evans, Paul Matsudaira, Roy E. Welsch and Jagath Rajapakse. BMC Bioinformatics Vol. 10, No. Suppl. 15 (2009): S4.
  • "Comparing and Visualizing Gene Selection and Classification Methods for Microarray." Menjoge, Rajiv, and Roy E. Welsch. In Machine Learning in Bioinformatics, edited by Jagath C. Rajapakse , Yan-Qing Zhang, 47-68. Hoboken, NJ: Wiley, 2009.
  • "Robust Risk: Using Robust Methods to Improve Investment Performance." Roy E. Welsch. In Proceedings of the 2008 Interface Symposium on Computer Science and Statistics, Durham, NC: December 2008.
  • "Statistical Analysis of Drug Treated Cell Morphologies from HCS Image Data." Alvin NG, V. Horodincu, J. Rajapakse, P. Madsudaira, Roy E. Welsch, and J. Evans. In Proceedings of the Third IAPR Conference on Pattern Recognition in Bioinformatics, edited by Alioune Ngom, Madhu Chetty, Shandar Ahmad, Heidelberg, Germany: October 2008.
  • "Size-Specific and Brightness-Weighted Cell Tracking in 2D images." Merlin Veronika, J. G. Evans, P. Matsudaira, Roy E. Welsch and J. C. Rajapakse. In Proceedings of the 12th International Conference on Research in Computational Molecular Biology, RECOMB 2008, edited by Limsoon Wong, Martin Vingron, Singapore: March 2008.
  • "Statistical Analysis of Macrophage Cell Morphology after Microtubule Disruption." Alvin NG, J. C. Rajapakse, J. G. Evans and Roy E. Welsch. In Proceedings of the 12th International Conference on Research in Computational Molecular Biology, RECOMB 2008, edited by Limsoon Wong, Martin Vingron, Singapore: March 2008.
  • "Geometric Confinement Influences Cellular Mechanical Properties I -- Adhesion Area Dependence." Su, Judith, X. Jiang, R. Welsch, G. Whitesides and P. So. Molecular Cellular Biomechanics Vol. 4, No. 2 (2007): 87-104.
  • "Robust Estimation or Robust Optimization for Portfolio Selection: Which Should You Use?" Roy E. Welsch, R. Menjoge and T. Nguyen. In Bulletin of the International Statistical Institute 56th Session, The Hague, The Netherlands: December 2007.
  • "Visualization and Analysis of High Resolution Cell Image Data." Roy E. Welsch. In Proceedings of the 2007 Interface Symposium on Computer Science and Statistics, Pasadena, CA: December 2007.
  • "Robust Variable Selection Using Least Angle Regression and Elemental Set Sampling." McCann, L. and Roy E. Welsch. Computational Statistics and Data Analysis Vol. 52, No. 1 (2007): 249-257.
  • "Application of Robust Statistics to Asset Allocation Models." Welsch, Roy E. and Xinfeng Zhou. REVSTAT Vol. 5, No. 1 (2007): 97-114.
  • "Comparing Variable Selection Methods in Gene Selection and Classification of Microarray Data." Roy E. Welsch and R. Menjoge. In 38th Symposium on the Interface of Statistics, Computing Science, and Applications 2006 (Interface 2006): Massive Data Sets and Streams, Atlanta, GA: May 2006.
  • "Algorithms for Robust Model Selection in Linear Regression." S. Morgenthaler, A. Zenide and Roy E. Welsch. In Theory and Applications of Recent Robust Methods, edited by A. Struyf, G. Pison, M. Hubert, S. Van Aelst, Basel, Switzerland: December 2004.
  • "Diagnostic Data Traces Using Penalty Methods." Roy E. Welsch and L. McCann. In Proceedings in Computational Statistics: COMPSTAT 2004, edited by J. Antoch, Heidelberg, Germany: August 2004.
  • "High Dimensional Portfolio Risk Estimation." Roy E. Welsch, G. Lauprete and A. Samarov. In Bulletin of the International Statistical Institute, The Hague, The Netherlands : December 2003.
  • "Collinearity Diagnostics: VIF’s Revisited." Roy E. Welsch, E. Newton and A. Venetoulias. In Proceedings in Computational Statistics COMPSTAT 2002, edited by B. Ronz, W. Hardle, Heidelberg, Germany: August 2002.
  • "Multivariate Statistical Process Control and Signature Analysis Using Eigenfactor Detection Methods." Kuang-Han Chen, Duane S. Boning and Roy E. Welsch. In Proceedings of the 33rd Symposium on the Interface: Computing Science and Statistics, edited by Amy Braverman, Arnold Goodman, Edward Wegman, Padhraic Smyth, Fairfax Station, VA: June 2002.
  • "Robust Portfolio Optimization." Lauprete, G., A. Samarov and Roy E. Welsch. Metrika Vol. 55, No. 1 (2002): 139-149.
  • "Cross-validated Regression Estimation." Welsch, Roy E. Bulletin of the International Statistical Institute Vol. 53, (2001): 223-224.
  • "The Use of Machine Check Architecture (MCA) to Perform Reliability Studies on Servers." Kurt Johnson, Jeff Demain, Shubha Prakashan, Roy E. Welsch and Alexander Samarov. In Proceedings of the 2001 American Statistical Association Quality and Productivity Research Conference, Alexandria, VA: December 2001.
  • "Is Cross-Validation the Best Approach for Principal Component and Ridge Regression?" Roy E. Welsch. In Proceedings of the 32nd Symposium on the Interface: Computing Science and Statistics, Irving, CA: June 2000.
  • "Portfolio Analysis Based on Value-at-Risk." Welsch, Roy E., G. Lemus and A. Samarov. Bulletin of the International Statistical Institute Vol. 52, (1999): 221-222.
  • "Partial Least Squares (PLS) Models Using Kodak Roll-Coating Data." Roy E. Welsch, H. Chen and Duane Boning. (Technical Report, Leaders for Manufacturing Program, Massachusetts Institute of Technology, Cambridge, MA).
  • "Portfolio Optimization Using Non-Gaussian Return Distributions." Roy E. Welsch. (Technical Report, Finance Research Center, Massachusetts Institute of Technology, Cambridge, MA).
  • "A New Modeling Methodology Combining Engineering and Statistical Modeling Methods: A Semiconductor Manufacturing Application." Roy E. Welsch, V. Sharma, Duane Boning, and Stephen Eppinger. (Technical Report, Leaders for Manufacturing Program, Massachusetts Institute of Technology, Cambridge, MA).
  • "Forecasting Capabilities and Model Diagnostics for Auto-Repressive Conditionally Heteroskedastic Time Series." Welsch, Roy E., and Henri Jeanscard. CCREMS Working Paper.
  • "Measuring and Updating Currency and Equity Market Volatility." Welsch, Roy E., P. Kempthorne, and A. Samarov. IFSRC Working Paper. 1998.
  • "Research on Variation Reduction Using Massive Data Streams." Welsch, Roy E. and V. Sharma. Bulletin of the International Statistical Institute Vol. 51, (1997): 289-290.
  • "Sequential Screening in Semiconductor Manufacturing, II: Exploiting Spatial Dependence." Longtin, Mark D., Lawrence M. Wein and Roy E. Welsch. Operations Research Vol. 44, No. 1 (1996): 173-195.
  • "Generalized Gaussian Analysis of Market Risk in Multinational Financial Markets." Welsch, Roy E., P. Kempthorne and K. Chui. Bulletin of the International Statistical Institute Vol. 50, (1995): 209-211.
  • "Subroutines for Maximum Likelihood and Quasi-Likelihood Estimation of Parameters in Nonlinear Regression Models." Bunch, David, David Gay and Roy E. Welsch. Transactions on Mathematical Software Vol. 19, No. 1 (1993): 109-130.
  • "Invited discussion of 'Statistical Consulting is Scholarship' by W. J. Wilson." Welsch, Roy E. The American Statistician Vol. 46, No. 4 (1992): 302-304.
  • "Exploratory Statistical Analysis of Currency and Equity Market Volatility." Welsch, Roy E., P. Kempthorne, and A. Samarov. IFSRC Working Paper N. 204-92. 1992.
  • "Collinearity Diagnostics: VIF's Revisited." Roy E. Welsch, E. Newton and A. Venetoulias. In Technical Report TR-68, Cambridge, MA: December 1990.
  • "An Alternative to Cp Model Selection that Emphasizes the Quality of Coefficient Estimation." Roy E. Welsch. In Probability, Statistics, and Mathematics: Papers in Honor of Samuel Karlin, edited by D. L. Iglehart, K. B. Athreya, T. W. Anderson, New York, NY: December 1989.
  • "Hypercard as an Environment for Guided Computing in Statistics." Roy E. Welsch, D. A. Belsley and A. Venetoulias. In Proceedings of the Twentieth Symposium on the Interface, Cambridge, MA: December 1989.
  • "Discussion of 'Regression Diagnostics with Dynamic Graphics' by R. D. Cook and S. Weisberg." Welsch, Roy E. Technometrics Vol. 31, No. 3 (1989): 307-308.
  • "Computer Guided Diagnostics." Roy E. Welsch, D. A. Belsley and A. Venetoulias. In COMPSTAT Proceedings in Computational Statistics, edited by D. Edwards, N. E. Raun, Heidelberg, Germany: December 1988.
  • "Maximum Likelihood and Quasi-Likelihood for Nonlinear Exponential Family Regression Models." Gay, David M. and Roy E. Welsch. Journal of the American Statistical Association Vol. 83, No. 404 (1988): 990-998.
  • "Modeling Energy Consumption: Using and Abusing Regression Diagnostics." Belsley, David and Roy E. Welsch. Journal of Business and Economic Statistics Vol. 6, No. 4 (1988): 442-447.
  • "The Next Generation: Statistical Computing in the 1990's." Roy E. Welsch. In Proceedings of the 46th Session of the International Statistical Institute, The Hague, The Netherlands: September 1987.
  • "Applications of Bounded-Influence and Diagnostic Methods in Energy Modeling." Welsch, Roy E. and Stephen Swartz. In Model Reliability, edited by D. A. Belsley, E. Kuh, 154-190. Cambridge, MA: MIT Press, 1986.
  • "Discussion of 'Influential Observations, High Leverage Points, and Outliers in Linear Regression' by S. Chatterjee and A. Hadi." Welsch, Roy E. Statistical Science Vol. 1, No. 3 (1986): 379-416.
  • "An Introduction to Regression Diagnostics." Roy E. Welsch. In Proceedings of the Thirtieth Conference on the Design of Experiments in Army Research, Development, and Testing, Report No. 85-23, Research Triangle Park, NC: December 1985.
  • "Resistant Estimation for Simultaneous-Equations Models Using Weighted Instrument Variables." Krasker, William S. and Roy E. Welsch. Econometrica Vol. 53, No. 6 (1985): 1475-1488.
  • "TROLL Program BIV: Bounded-Influence Instrumental Variables." Roy E. Welsch and A. Samarov. Technical Report No. 44, M.I.T. Center for Computational Research in Economics in Management Science. 1984.
  • "Estimation for Dirty Data and Flawed Models." Krasker, W. S., E. Kuh and Roy E. Welsch. In Handbook of Econometrics, edited by Michael D. Intrilligator, Zvi Griliches, 651-698. Amsterdam, The Netherlands: North-Holland, 1983.
  • "Influential Data." Welsch, Roy E. In Encyclopedia of Statistical Sciences, edited by N. L. Johnson, S. Kotz, 119-212. New York, NY: Wiley, 1983.
  • "Leverage." Welsch, Roy E. In Encyclopedia of Statistical Sciences, edited by N. L. Johnson, S. Kotz, 610-611. New York, NY: Wiley, 1983.
  • "Discussion of 'Developments in Linear Regression Methodology: 1959-1982,' by R. R. Hocking." Welsch, Roy E. Technometrics Vol. 25, No. 3 (1983): 245-246.
  • "The Use of Bounded-Influence Regression in Data Analysis: Theory, Computation and Graphics." Roy E. Welsh and W. S. Krasker. In Computer Science and Statistics: Fourteenth Symposium on the Interface, Berlin, Germany: June 1983.
  • "Diagnostics and Graphics for Influential Data." Roy E. Welsch. In American Society for Quality Control 37th Annual Quality Congress Transactions, Milwaukee, WI: May 1983.
  • "Discussion of 'Minimax Aspects of Bounded-Influence Regression,' by Peter Huber." Krasker, William and Roy E. Welsch. Journal of the American Statistical Association Vol. 78, No. 381 (1983): 72-73.
  • "Efficient Bounded-Influence Regression Estimation." Krasker, William S. and Roy E. Welsch. Journal of the American Statistical Association Vol. 77, No. 379 (1982): 596-604.
  • "Discussion of 'Robust Methods in Econometrics,' by Roger Koenker." Welsch, Roy E. Econometric Reviews Vol. 1, No. 2 (1982): 279-284.
  • "Influence Functions and Regression Diagnostics." Welsch, Roy E. In Modern Data Analysis, edited by A. Siegel, R. Launer, 149-169. New York, NY: Academic Press, Inc., 1982.
  • "Computational Procedures for Bounded-Influence Regression." Roy E. Welsch and A. Samarov. In COMPSTAT 1982: Proceedings in Computational Statistics, edited by H. Caussinus, P. Ettinger, R. Tomassone, Heidelberg, Germany: January 1982.
  • "Discussion of 'Regression Diagnostics, Transformations, and Constructed Variables,' by A. C. Atkinson." Welsch, Roy E. J. R. Statist. Soc. B Vol. 44, (1982): 1-36.
  • "Analysis of the Validity of the Coefficient Estimates and Forecasting Properties of the RDFOR Models, Department of Energy Technical Report." Roy E. Welsch, Edwin Kuh, S. Lahiri, A. Minkoff, and S. Swartz.
  • "Computational Procedures for Bounded-Influence and Robust Regression." Roy E. Welsch, S. Peters, and A. Samarov, Technical Report No. 30, M.I.T. Center for Computational Research in Economics and Management Science.
  • "Efficient Computing of Regression Diagnostics." Velleman, Paul and Roy E. Welsch. The American Statistician Vol. 35, No. 4 (1981): 234-242.
  • "An Adaptive Nonlinear Least-Squares Algorithm." Welsch, Roy with John Dennis and David Gay. Transactions on Mathematical Software Vol. 7, No. 3 (1981): 348-383.
  • "NLS: Nonlinear Least-Squares Regression." Welsch, Roy E. TROLL Documentation Series, M.I.T. Information Processing Center. 1981.
  • "Regression Sensitivity Analysis and Bounded-Influence Estimation." Welsch, Roy E. In Evaluation of Econometric Models, edited by James Ramsey, Jan Kmenta, 153-167. New York, NY: Academic Press, 1980.
  • "Robust and Bounded-Influence Regression." Roy E. Welsch. In Proceedings of the 42nd Session of the International Statistical Institute, Voorburg, Netherlands: December 1980.
  • Regression Diagnostics: Identifying Influential Data and Sources of Collinearity. Belsley, David, Edwin Kuh and Roy E. Welsch. New York, NY: John Wiley and Sons, Inc., 1980.
  • "Econometric Models and Their Assessment for Policy: Some New Diagnostics Applied to the Translog Energy Demand in Manufacturing." Roy E. Welsch and Edwin Kuh. In Proceedings of the Workshop on Validation and Assessment Issues of Energy Models, edited by S. Gass, Washington, DC: January 1980.
  • "Regression Diagnostics for Desktop Computers." Roy E. Welsch. In COMPSTAT 1980: Proceedings in Computational Statistics, edited by D. Wishart, M. M. Barritt, Heidelberg, Germany: January 1980.
  • "Improving the Reliability of Econometric Models." Roy E. Welsch. In 1979 Proceedings of the Social Statistics Section, Washington, DC: December 1979.
  • "Data Analysis, Communication, and Control." Welsch, Roy E. In Communications and Control in Society, edited by Klaus Krippendorf, 99-114. London, England: Gordon and Breech, Inc., 1979.
  • "Discussion of 'Nonparametric Statistical Data Modeling' by Emanuel Parzen." Welsch, Roy E. Journal of the American Statistical Association Vol. 74, No. 365 (1979): 123-124.
  • "Discussion of 'Teaching Statistical Computing Using Computer Packages' by Ronald A. Thisted." Welsch, Roy E. The American Statistician Vol. 33, No. 1 (1979): 34.
  • "A Comparison of Heuristic Methods Used in Hierarchical Production Planning." Roy E. Welsch, H. Haas, and A. Hax. Technical Report No. 160, Operations Research Center, M.I.T. 1979.
  • "Computing Regression Diagnostics." Roy E. Welsch. In Proceedings of the Stanford Conference on Numerical and Statistical Computing, edited by Gene Golub, Virginia Klema, Cambridge, MA: December 1978.
  • "History of Bounded-Influence Estimation and Comments on Paper by Frank Hampel, David Hinkley, and R. Douglas Martin." Roy E. Welsch. In 1978 Proceedings of the A. S. A. Statistical Computing Section, Washington, DC: December 1978.
  • "Techniques for Nonlinear Least-Squares and Robust Regression." Dennis, John and Roy E. Welsch. Communications in Statistics Vol. 7, No. 4 (1978): 345-359.
  • "The Hat Matrix in Regression and ANOVA." Hoaglin, David C. and Roy E. Welsch. The American Statistician Vol. 32, No. 1 (1978): 17-22.
  • "Discussion of 'Statisticians Can Matter' by Harry V. Roberts." Welsch, Roy E. The American Statistician Vol. 32, No. 2 (1978): 52-53.
  • "Finding Influential Subsets of Data in Regression Models." Roy E. Welsch and Steve Peters. In Proceedings of the Eleventh Interface Symposium on Computer Science and Statistics, edited by A. R. Gallant, T. M. Gerig, Raleigh, NC: March 1978.
  • "TROLL Experimental Programs, SENSSYS (Model Sensitivity Analysis)." Welsch, Roy E. and Steve Peters. Computing Documentation. M.I.T. Information Processing Center.
  • "Discussion of 'Do Robust Estimators Work with Real Data?' by Stephen M. Stigler." Welsch, Roy E. Annals of Statistics Vol. 5, (1977): 1095-1096.
  • "Nonlinear Statistical Data Analysis." Roy E. Welsch. In Proceedings of the Tenth Interface Symposium on Computer Science and Statistics, edited by D. Fife, D. Hogben, Washington, DC: December 1977.
  • "Robust Regression Using Iteratively Re-weighted Least-Squares." Holland, Paul and Roy E. Welsch. Communications in Statistics, Part A Vol. 6, No. 9 (1977): 813-827.
  • "Stepwise Multiple Comparison Procedures." Welsch, Roy E. Journal of the American Statistical Association Vol. 72, No. 359 (1977): 566-575.
  • "A Monte Carlo Study of Aggregation Effects on Regression Parameter Estimates." Welsch, Roy E., and Edwin Kuh, Working Paper. 1977.
  • "Linear Regression Diagnostics." Welsch, Roy E., and Edwin Kuh, Working Paper. 1977.
  • "Ridge and Robust Regression Using Parametric Linear Programming." Welsch, Roy E., and S. Pariente, Working Paper. 1977.
  • "Tables for Stepwise Multiple Comparison Procedures." Welsch, Roy E., Working Paper. 1977.
  • "Confidence Regions for Robust Regression." Roy E. Welsch. In 1975 Proceedings of the ASA Statistical Computing Section, Alexandria, VA: December 1976.
  • "Graphics for Data Analysis." Welsch, Roy E. Computers and Graphics Vol. 2, No. 1 (1976): 31-37.
  • "Some Evaluation Criteria for Interactive Statistical Program Packages." Weslch, Roy E. and P. Velleman. Communications in Statistics Vol. B5, No. 4 (1976): 197-205.
  • Proceedings of the Ninth Interface Symposium on Computer Science and Statistics. Hoaglin, David C., and Roy E. Welsch (Eds.). Boston, MA: Prindle, Weber and Schmidt, 1976.
  • "MIT-SNAP: An Interactive Data Analysis System." Roy E. Welsch, David Hoaglin and Steve Peters. In Proceedings of the Ninth Interface Symposium on Computer Science and Statistics, edited by David C. Hoaglin, Roy E. Welsch, Boston, MA: April 1976.
  • "The Variances of Regression Coefficient Estimates Using Aggregate Data." Welsch, Roy E. and Edwin Kuh. Econometrica Vol. 44, No. 2 (1976): 353-363.
  • "Comparing Relative and Total Cost Multiple Comparison Procedures Via James-Stein Estimators." Welsch, Roy E., Working Paper. 1976.
  • "Algorithms and Plots for Model Validation." Welsch, Roy E. In Proceedings of the NSF Vail Conference on Model Formulation, Validation, and Improvement, edited by E. P. Howrey, Cambridge, MA: December 1975.
  • "Robust Nonlinear Regression Using the DOGLEG Algorithm." Roy E. Welsch and R. Becker. In Proceedings of the Computer Science and Statistics Eighth Annual Symposium on the Interface, edited by J. W. Frane, Los Angeles, CA: December 1975.
  • "MIT-SNAP User' Manual." Welsch, Roy E. Computing Documentation, MIT Sloan School of Management. 1975.
  • "TROLL Experimental Programs: Robust and Ridge Regression." Welsch, Roy E. Computing Documentation, M.I.T. Information Processing Center. 1975.
  • "TROLL Experimental Programs." Welsch, Roy E. Computing Documentation. CLOUDS, STARS, FACES, M.I.T. Information Processing Center. 1974.
  • "A Convergence Theorem for Extreme Values from Gaussian Sequences." Welsch, Roy E. Annals of Probability Vol. 1, No. 3 (1973): 398-404.
  • "Limit Laws for Extreme Order Statistics from Strong-Mixing Processes." Welsch, Roy E. Annals of Mathematical Statistics Vol. 43, No. 2 (1972): 439-446.
  • "A Modification of the Newman-Keuls Procedure for Multiple Comparisons." Welsch, Roy E., Working Paper. 1972.
  • "A Multiple Comparison Procedure Based on Gaps." Welsch, Roy E., Working Paper. 1972.
  • "A Weak Convergence Theorem for Order Statistics from Strong-Mixing Processes." Welsch, Roy E. Annals of Mathematical Statistics Vol. 42, No. 5 (1971): 1637-1646.