Nathaniel E. Helwig

Associate Professor of Psychology and Statistics

Invited Talks:

• Helwig, N. E. (2021, June 25). Statistical learning via spectrally sparse smoothers. 4th International Conference on Econometrics and Statistics. Virtual Conference, Hong Kong University of Science and Technology, Hong Kong.
• Helwig, N. E. (2021, Apr. 23). Spectrally sparse nonparametric regression via elastic net regularized smoothers. Statistics & Data Science Colloquium Series. University of Central Florida, Orlando, Florida, USA.
• Helwig, N. E. (2021, Apr. 5). Exploring latent brain networks via simultaneous component analysis. Quantitative Methods Colloquium, Vanderbilt University. Nashville, Tennessee, USA.
• Helwig, N. E. (2019, Mar. 8). Reproducible data wrangling and modeling with R. Department of Psychology Open and Reproducible Science Brown Bag Series. University of Minnesota.
• Helwig, N. E. (2018, Aug. 16). Simple statistics in R. IRSA Reproducible Research Workshop, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2018, Aug. 16). Linear regression in R. IRSA Reproducible Research Workshop, Minneapolis, Minnesota, USA.
• Almquist, Z. W., Helwig, N. E., & You, Y. (2018, Aug. 12). Connecting HUD continuum of care point-in-time homeless counts to US census geographies: 2005-2016. American Sociological Association Annual Meeting, Philadelphia, Pennsylvania, USA.
• Helwig, N. E. (2018, Aug. 4). Statistical learning of successful smiles. Joint Statistical Meetings, Vancouver, British Columbia, Canada.
• Helwig, N. E., & Ma, P. (2018, June 19). Smoothing spline ANOVA for super-large samples: Scalable computation via rounding parameters. ICSA Applied Statistics Symposium, New Brunswick, New Jersey, USA.
• Helwig, N. E. (2018, June 13). Constrained Parallel Factor Analysis with applications to functional data. ThRee-way methods In Chemistry And Psychology (TRICAP) Conference, Angel Fire, New Mexico, USA.
• Helwig, N. E. (2017, Oct. 10). lme4 and Beyond. IRSA Mixed Models Workshop, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2017, Oct. 9). Statistical learning of successful smiles. Third Annual Twin Cities American Statistical Association Fall Research Conference, University of St. Thomas, Minneapolis, Minnesota, USA.
• Helwig, N. E., & Snodgress, M. A. (2017, Sep. 21). Discovering genuine resting state brain networks via simultaneous component analysis. IRSA Neuro-Statistics Workshop, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2017, Aug. 31). Simple statistics in R. IRSA Reproducible Research Workshop, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2017, Aug. 31). Linear regression in R. IRSA Reproducible Research Workshop, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2017, July 31). Multiway factor analysis with functional and structural constraints. Joint Statistical Meetings, Baltimore, Maryland, USA.
• Helwig, N. E. (2017, July 18). Multiway factor analysis with functional and structural constraints. International Meeting of the Psychometric Society, University of Zurich, Zurich, Switzerland.
• Helwig, N. E. (2017, May 23). Estimating latent trends in multivariate longitudinal data via Parafac2 with functional and structural constraints. Modern Modeling Methods Conference, Storrs, Connecticut, USA.
• Helwig, N. E., Harper, J., Malone, S., & Iacono, W. (2017, May 6). Modeling longitudinal change in brain signals of twins. IRSA Neuro-Statistics Workshop, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2017, Feb. 25). Nonparametric mixed-effects regression for large samples. Conference on Statistical Practice, Jacksonville, Florida, USA.
• Helwig, N. E. (2016, Dec. 10). Efficient estimation of variance components in nonparametric mixed-effects models with large samples. 9th International Conference of the ERCIM WG on Computational and Methodological Statistics, European Consortium for Informatics and Mathematics, University of Seville, Seville, Spain.
• Helwig, N. E. (2016, July 31). Nonparametric spatiotemporal analysis of neuroimaging data. Joint Statistical Meetings, Chicago, Illinois, USA.
• Helwig, N. E. (2016, July 12). Nonparametric mixed-effects models for psychological data. International Meeting of the Psychometric Society, Asheville, North Carolina, USA.
• Helwig, N. E. (2016, May 25). Efficient estimation of variance components in nonparametric mixed-effects models with large samples. Modern Modeling Methods Conference, Storrs, Connecticut, USA.
• Helwig, N. E. (2015, Aug. 6). Smoothing splines for large samples. Institute of Mathematical Statistics New Researchers Conference, Seattle, Washington, USA.
• Helwig, N. E. (2015, Apr. 15). Data-driven neuroimaging analysis. April Meeting of the ICID Group, University of Minnesota, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2014, Nov. 13). Tensor analysis of fMRI data. November Meeting of the Imaging Working Group, University of Minnesota, Minneapolis, Minnesota, USA.
• Helwig, N. E. (2014, Aug. 9). Fast and stable smoothing spline analysis of variance models for large samples with applications to electroencephalography data analysis. American Psychological Association Annual Convention, Washington D.C., USA.
• Helwig, N. E. (2014, Aug. 4). Smoothing spline analysis of variance models for electroencephalography data analysis. Joint Statistical Meetings, Boston, Massachusetts, USA.
• Helwig, N. E. (2014, May 29). Semiparametric regression of big data in R. Computational Science and Engineering Big Data Workshop, University of Illinois, Urbana, Illinois, USA.
• Helwig, N. E., & Ma, P. (2013, Aug. 6). Fast and stable multiple smoothing parameter selection in smoothing spline analysis of variance models with large samples. Joint Statistical Meetings, Montreal, Quebec, Canada.
• Helwig, N. E., & Hong, S. (2009, June 18). Parallel factor analysis of gait data. Three-way Methods in Chemistry and Psychology, Vall de Nuria, Spain.

Poster Presentations:

• Snodgress, M. A., & Helwig, N. E. (2021, Oct. 16). Cross-validated simultaneous component analysis for identifying individual and group differences in latent brain networks. Annual Meeting of the Society for Psychophysiological Research, Virtual Meeting.
• Duffy, K. A., & Helwig, N. E. (2021, Sep. 17). Predicting ADHD symptomatology from resting state network correlations using nonparametric smoothing spline regression. Annual Meeting of the Flux Society for Developmental Cognitive Neuroscience, Virtual Meeting.
• Snodgress, M. A., & Helwig, N. E. (2021, Apr. 15). Exploring latent brain networks with cross-validated simultaneous component analysis. Spring Meeting of the Twin Cities Chapter of the American Statistical Association, Minneapolis, Minnesota, United States.
• McCoy, M. E., Helwig, N. E., & Logue, C. (2019, June 27). The impact of hyperbaric oxygen on treating idiopathic sudden sensorineural hearing loss. Annual Scientific Meeting for the Undersea & Hyperbaric Medical Society, Río Grande, Puerto Rico.
• Malone, S., Helwig, N. E., Harper, J., & Iacono, W. (2018, Oct. 6). Substance-abuse risk among adolescents is associated with increased impulsive errors and decreased theta power in a multiway analysis of NoGo EEG activity. Society for Psychophysiological Research Annual Meeting, Quebec City, Quebec, Canada.
• Lawrence R. L., Sessions W. C., Jensen M., Staker J. L., Eid A., Breighner R., Helwig, N. E., Braman J. P., & Ludewig P. M. (2018, Apr. 17). The effect of glenohumeral plane of elevation on supraspinatus subacromial proximity. University of Minnesota Supercomputing Institute Research Exhibition, Minneapolis, Minnesota, USA.
• Hammell, A., Helwig, N. E., Kaczkurkin, A., & Lissek, S. (2018, Apr. 6). Temporal dynamics of fear generalization in PTSD across learning trials: A nonparametric exploratory model. Anxiety and Depression Association of America Annual Conference, Washington D.C., USA.
• Ruprecht, M. R., & Helwig, N. E. (2017, Oct. 9). A nonparametric model for right-wing authoritarianism. Third Annual Twin Cities American Statistical Association Fall Research Conference, University of St. Thomas, Minneapolis, Minnesota, USA.
• Jordan, V. A., McCoy, M. E., Helwig, N. E., & Odland, R. (2017, Sep. 12). Treatment outcomes of idiopathic sudden sensorineural hearing loss. American Academy of Otolaryngology-Head and Neck Surgery Foundation (AAO-HNSF) Annual Meeting, Chicago, Illinois, USA.
• Ruprecht, M. R., & Helwig, N. E. (2017, July 20). A nonparametric look at self-esteem development by gender and socioeconomic region. Pipelines into Biostatistics Symposium, Harvard University, Boston, Massachusetts, USA.
• Ruprecht, M. R., & Helwig, N. E. (2017, Apr. 20). A nonparametric model for right-wing authoritarianism. Undergraduate Research Opportunities Program Showcase, University of Minnesota, Minneapolis, Minnesota, USA.
• Ruprecht, M. R., & Helwig, N. E. (2017, Apr. 18). A nonparametric model for right-wing authoritarianism. Undergraduate Research Opportunities Program Showcase, University of Minnesota, Duluth, Minnesota, USA.
• Mervis, J., Helwig, N. E., Meyer-Kalos, P., & MacDonald, A. (2017, Mar. 27). The mismeasurement of psychosis: parsing differences in discriminating power across symptom dimensions. 16th International Congress on Schizophrenia Research, San Diego, California, USA.
• Ruprecht, M. R., & Helwig, N. E. (2016, Nov. 18). The determination of an effective smile. Undergraduate Research Opportunities Program Showcase, University of Minnesota, Minneapolis, Minnesota, USA.
• Ruprecht, M. R., & Helwig, N. E. (2016, Oct. 3). The determination of an effective smile. Second Annual Twin Cities American Statistical Association Fall Research Conference, Medtronic Campus, Mounds View, Minnesota, USA. [Winning Poster]
• Helwig, N. E. (2016, Sep. 24). Smoothing spline ANOVA models for analyzing event-related potential data. Society for Psychophysiological Research Annual Meeting, Minneapolis, Minnesota, USA.
• Ruprecht, M. R., & Helwig, N. E. (2016, Apr. 29). A nonparametric look at self-esteem development by gender and socioeconomic region. Undergraduate Research Opportunities Program Showcase, University of Minnesota, Minneapolis, Minnesota, USA.
• Ruprecht, M. R., & Helwig, N. E. (2016, Apr. 23). A nonparametric look at self-esteem development by gender and socioeconomic region. Minnesota Undergraduate Psychology Conference, Augsburg College, Minneapolis, Minnesota, USA.
• Ruprecht, M. R., & Helwig, N. E. (2016, Apr. 14). The determination of an effective smile. Undergraduate Research Opportunities Program Showcase, University of Minnesota, Duluth, Minnesota, USA.
• Ruprecht, M. R., & Helwig, N. E. (2015, Nov. 17). A nonparametric look at self-esteem development. Undergraduate Research Opportunities Program Showcase, University of Minnesota, Duluth, Minnesota, USA. [Winning Poster]
• Ruprecht, M. R., & Helwig, N. E. (2015, Oct. 30). A nonparametric look at self-esteem development. First Annual Twin Cities American Statistical Association Fall Research Conference, Mayo Clinic, Rochester, Minnesota, USA. [Winning Poster]
• Helwig, N. E. (2013, Apr. 24-25). A look into the mind of an alcoholic: Smoothing spline models for EEG data analysis. Computational Science and Engineering Annual Meeting, University of Illinois, Urbana, Illinois, 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, Jan. 4-7). Quantitative characterization of complex motion patterns using shaped-based and multivariate techniques. National Science Foundation (NSF) Civil, Mechanical and Manufacturing Innovation (CMMI) Research Innovation Conference, Atlanta, Georgia, 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. Annual Meeting for the American Society of Biomechanics, Providence, Rhode Island, USA.
• Helwig, N. E., Hong, S., & Hsiao-Wecksler, E. T. (2009, Aug. 26-29). Partitioning gait data into temporal and intensity differences. Annual Meeting for the American Society of Biomechanics, State College, Pennsylvania, USA.
• Helwig, N. E., Hong, S., & Hsiao-Wecksler, E. T. (2009, Aug. 26-29). Methods to time-normalize gait cycle data. Annual Meeting for the American Society of Biomechanics, State College, Pennsylvania, 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 shaped-based and multivariate techniques. National Science Foundation (NSF) Civil, Mechanical and Manufacturing Innovation (CMMI) Research Innovation Conference, Honolulu, Hawaii, USA.