Contact Information Curriculum Vitae Nathaniel E. Helwig University: Department of Psychology & School of Statistics, University of Minnesota Address: Psych: N650 Elliot Hall, 75 E River Road, Minneapolis, MN 55455, USA Stat: 375 Ford Hall, 224 Church Street SE, Minneapolis, MN 55455, USA Email: helwig@umn.edu Alt. Email: helwig@stat.umn.edu Websites: http://www.psych.umn.edu/people/facultyprofile.php?uid=helwig http://stat.umn.edu/~helwig/ Higher Education May 2013 Dec 2011 Dec 2010 Doctor of Philosophy in Quantitative Psychology Department of Psychology, University of Illinois, Champaign, IL, USA Thesis: Fast and stable smoothing spline analysis of variance models for large samples with applications to electroencephalography data analysis Master of Arts in Psychology Department of Psychology, University of Illinois, Champaign, IL, USA Thesis: Parallel factor analysis of gait waveform data: A multimode extension of principal component analysis Master of Science in Statistics Department of Statistics, University of Illinois, Champaign, IL, USA Recent Academic Appointments Aug 2014 Position: Assistant Professor to Present Location: Department of Psychology and School of Statistics University of Minnesota: Twin Cities Aug 2013 Position: Visiting Assistant Professor to Aug 2014 Location: Department of Statistics University of Illinois at Urbana-Champaign Nathaniel E. Helwig 1 Curriculum Vitae
Teaching Experience Undergrad Level Graduate Level Introduction to Statistics, Department of Psychology, University of Illinois Applied Statistics, Department of Statistics, University of Illinois Nonparametric Methods, School of Statistics, University of Minnesota Statistical Methods I, Department of Psychology, University of Illinois Statistical Methods II, Department of Psychology, University of Illinois Multivariate Analysis, Department of Psychology, University of Illinois Advanced Data Analysis, Department of Statistics, University of Illinois Journal Publications Helwig, N. E., & Ma, P. (in press). Fast and stable multiple smoothing parameter selection in smoothing spline analysis of variance models with large samples. Journal of Computational and Graphical Statistics doi: Helwig, N. E., & Anderson, C. J. (2014). Review of Handbook of Advanced Multilevel Analysis by J. J. Hox & J. K. Roberts (Eds.). Psychometrika, 79, 175 177. doi: 10.1007/S11336-013-9351-3 Helwig, N. E. (2013). The special sign indeterminacy of the direct-fitting Parafac2 model: Some implications, cautions, and recommendations for Simultaneous Component Analysis. Psychometrika, 78, 725 739. doi: 10.1007/S11336-013-9331-7 Helwig, N. E., & Hong, S. (2013). A critique of Tensor Probabilistic Independent Component Analysis: Implications and recommendations for multi-subject fmri data analysis. Journal of Neuroscience Methods, 213, 263 273. doi: 10.1016/j.jneumeth.2012.12.009 Helwig, N. E., Hong, S., & Bokhari, E. (2013). Analyzing individual and group differences in multijoint multiwaveform gait data using the Parafac2 model. International Journal for Numerical Methods in Biomedical Engineering, 29, 62 82. doi: 10.1002/cnm.2492 Helwig, N. E., Hong, S., & Polk, J. D. (2012). Parallel Factor Analysis of gait waveform data: A multimode extension of Principal Component Analysis. Human Movement Science, 31, 630 648. doi: 10.1016/j.humov.2011.06.011 Nathaniel E. Helwig 2 Curriculum Vitae
Helwig, N. E., Hong, S., Hsiao-Wecksler E. T., & Polk, J. D. (2011). Methods to temporally align gait cycle data. Journal of Biomechanics, 44, 561 566. doi: 10.1016/j.jbiomech.2010.09.015 Manuscripts Under Review or In Preparation Helwig, N. E., & Ma, P. (in preparation). bin-sampled knots. Stable smoothing spline approximation via Helwig, N. E., & Ma, P. (in preparation). Nonparametric Gaussian regression for ultra large samples: Scalable computation via rounding parameters. Bokhari, E., Hong, S., Helwig, N. E., Polk, J. D., & Ragetly, C. A. (in preparation). Examining cranial cruciate ligament deficiency and its effect on canine gait using Parafac2. Software Packages Helwig, N. E. (2014). bigsplines: Smoothing splines for large samples. R package version 1.0-3. http://cran.r-project.org/package=bigsplines Invited Talks Helwig, N. E. (2014, Aug. 8 10). Fast and stable smoothing spline analysis of variance models for large samples with applications to electroencephalography data analysis. Presented at the APA Convention, Washington D.C., United States. Helwig, N. E. (2014, Aug. 2 7). Smoothing spline analysis of variance models for electroencephalography data analysis. Presented at the Joint Statistical Meetings, Boston, Massachusetts, United States. Helwig, N. E. (2014, May 28 30). Semiparametric regression of big data in R. Presented at the Computational Science and Engineering Big Data/Data Analytics Research Conference, Champaign, Illinois, United States. Helwig, N. E., & Ma, P. (2013, Aug. 3 8). Fast and stable multiple smoothing parameter selection in smoothing spline analysis of variance models with large samples. Presented at the Joint Statistical Meetings, Montreal, Quebec, Canada. Helwig, N. E. (2013, Mar. 4). Smoothing spline analysis of variance models: Theory and model building. Presented at the Quantitative Psychology Brownbag Meeting, Champaign, Illinois, United States. Article was selected as a Pick of the Week in March, 2011 by BIOMCH-L (the listserve sponsored by the International Society of Biomechanics). Nathaniel E. Helwig 3 Curriculum Vitae
Helwig, N. E., Hong, S., Polk, J. D., & Bokhari, E. (2011, Jan. 31). Analysis of multimode gait waveform data using the Parafac and Parafac2 models. Presented at the Quantitative Psychology Brownbag Meeting, Champaign, Illinois, United States. Helwig, N. E., & Hong, S. (2009, June 14 19). Parallel factor analysis of gait data. Presented at Three-way Methods in Chemistry and Psychology (TRICAP 2009), Vall de Núria, Spain. Helwig, N. E., & Hong, S. (2009, Apr. 20). Decomposing gait shapes using GPA and Parafac. Presented at the Quantitative Psychology Brownbag Meeting, Champaign, Illinois, United States. Helwig, N. E., & Hong, S. (2008, Apr. 21). Multivariate analysis of human gait. Presented at the Quantitative Psychology Brownbag Meeting, Champaign, Illinois, United States. Poster Presentations Helwig, N. E. (2013, Apr. 24 25). A look into the mind of an alcoholic: Smoothing spline models for EEG data analysis. Presented at the Computational Science and Engineering Annual Meeting (CSE 2013), Urbana, IL, USA. Hsiao-Wecksler, E. T., Dankowicz, H., Hong, S., Lague, M. R., Polk, J. D., Rosengren K. S., Bokhari, E., DiBerardino, L. A. III, Helwig, N. E., & Park, K. (2011, Jan. 4 7). Quantitative characterization of complex motion patterns using shape-based and multivariate techniques. Presented at the National Science Foundation (NSF) Civil, Mechanical and Manufacturing Innovation (CMMI) Research and Innovation Conference 2011, Atlanta, GA, USA. Helwig, N. E., Hong, S., Polk, J. D., & Lague, M. R. (2010, Aug. 18 21). Analysis of gait cycle shapes using parallel factor analysis. Presented at the Annual Meeting for the American Society of Biomechanics (ASB 2010), Providence, RI, USA. Helwig, N. E., Hong, S., & Hsiao-Wecksler, E. T. (2009, Aug. 26 29). Partitioning gait data into temporal and intensity differences. Presented at the Annual Meeting for the American Society of Biomechanics (ASB 2009), State College, PA, USA. Helwig, N. E., Hong, S., & Hsiao-Wecksler, E. T. (2009, Aug. 26 29). Methods to timenormalize gait cycle data. Presented at the Annual Meeting for the American Society of Biomechanics (ASB 2009), State College, PA, USA. Hsiao-Wecksler, E. T., Dankowicz, H., Hong, S., Lague, M. R., Polk, J. D., Rosengren K. S., DiBerardino, L. A. III, Helwig, N. E., & Park, K. (2009, June 22 25). Quantitative characterization of complex motion patterns using shape-based and multivariate techniques. Presented at the National Science Foundation (NSF) Civil, Mechanical Nathaniel E. Helwig 4 Curriculum Vitae
and Manufacturing Innovation (CMMI) Research and Innovation Conference 2009, Honolulu, HI, USA. Technical Skills Programming Languages: R, MATLAB, Fortran, C/C++, SQL Statistical Programs: R, MATLAB, SAS, SPSS, SYSTAT Other: L A TEX, Mac OS, Unix/Linux, Windows Academic and Professional Associations Jan 2013 to Present Dec 2012 to Present Aug 2010 to Present Aug 2010 to Aug 2011 Aug 2009 to May 2013 Inducted May 2006 Inducted May 2006 Member Psychometric Society Member Multiple Sections, American Statistical Association Member Division 5, American Psychological Association Student Representative of the Membership Committee Division 5, American Psychological Association Graduate Student Organization Representative Quantitative Division, Department of Psychology, University of Illinois Psi Chi Honor Society Member University of Miami Chapter, University of Miami Phi Beta Kappa Honor Society Member Delta Chapter of Florida, University of Miami Nathaniel E. Helwig 5 Curriculum Vitae
Research Awards Spring 2014 Spring 2013 Spring 2013 Spring 2011 Distinguished Dissertation Award Division 5, American Psychological Association Details: Received for my dissertation about nonparametric analysis of electroencephalography data, advised by Ping Ma. Student Paper Competition Winner Statistical Computing/Graphics Sections, American Statistical Association Details: Received for a paper entitled Fast and stable multiple smoothing parameter selection in smoothing spline analysis of variance models with large samples, co-authored by Ping Ma. Nancy Hirschberg Award Department of Psychology, University of Illinois Details: The Nancy Hirschberg Award is for excellent work done in one of Prof. Hirschberg s areas of interest, i.e. individual difference, personality, human judgement, and multivariate analysis. Woodrow Fellowship Department of Psychology, University of Illinois Details: The Woodrow Fellowship is awarded to the most promising graduate students in the Department of Psychology doing basic scientific research in the field of psychology. Nathaniel E. Helwig 6 Curriculum Vitae
Teaching Awards Spring 2010 Spring 2010 Spring 2010 & Fall 2009 Outstanding Quantitative Psychology Doctoral Student Department of Psychology, University of Illinois Details: Our first award, in 2010, goes to Nate Helwig, for his extraordinary work as a teaching assistant in PSYC 406/407, the Department wide graduate statistics sequence. Nate has shown excellence and outstanding dedication to teaching. Graduate Teaching Certificate Center for Teaching Excellence, University of Illinois Details: The Graduate Teacher Certificate is a program of the Center for Teaching Excellence (CTE) and is supported by campus academic units and the Graduate College. It is designed to encourage TAs to develop their teaching skills and reflective practice. List of Teachers Ranked as Excellent by their Students Center for Teaching Excellence, University of Illinois Details: The Instructor & Course Evaluation System (ICES) is used across campus as the official instructor and course evaluation for faculty and teaching assistants. Nathaniel E. Helwig 7 Curriculum Vitae