Ph.D., University of Minnesota, 1989
56 East River Rd
Areas of Interest
Statistics education research; Activity-based instruction; Curriculum development; Assessment development; Mixed-Methods research methods
My current research interests began with my doctoral dissertation, in which I looked at the effects of an activity-based instructional approach on students’ understanding of probability. I continue to experiment with activity-based approaches, which I get to test when teaching statistics. I am currently working on five projects: The Levels of Conceptual Understanding in Statistics (LOCUS) project (NSF DRL-1118168) with Tim Jacobbe (U of Florida), Jeff Haberstroh (ETS) and Brad Hartlaub (Kenyon College) to develop high quality assessments of statiscal understanding for grades 6 to 12; A CFA and IRT analysis of nine years of data from administration of the Comprehensive Assessment of Outcomes in Statistics (CAOS) assessment with Anelise Sabbag (U of Minnesota); An analysis of the statistical thinking of nine students who were enrolled in a first course in statistics that taught randomization-based statistical methods, with Andy Zieffler, Ethan Brown, Jonathan Brown and Mike Huberty (all at the U of Minnesota); An analysis of 10- to 11-year-old Australian students' reasoning about varability with Katie Makar (U of Queensland) and Helen Doerr (Syracuse University); An analysis of International Teaching Assistants' experience working with U.S. American undersgraduates enrolled in STEM courses with Kyoung-Ah Nam (American University).
My other interests include playing guitar and harmonica, woodworking and home improvement projects, spending time with my family, spending time in the outdoors (especially canoeing), and practicing a traditional style of Japanese karate.
Courses I teach
EPSY 5271—Becoming a Teacher of Statistics
EPSY 8251—Statistical Methods in Education I
EPSY 8252—Statistical Methods in Education II
EPSY 8271—Statistics Education Research Seminar: Studies on Teaching and Learning Statistics
Nam, K. A., Weaver, G., & delMas, R. (in press). Major Ethical Issues in the Field of Intercultural Relations: An Exploratory Study. International Journal of Intercultural Relations.
delMas, R., Garfield, J. & Zieffler, A. (2014). Using TinkerPlots™ to develop tertiary students' statistical thinking in a modeling-based introductory statistics class. In T. Wassong, D. Frischemeier, P. R. Fischer, R. Hochmuth and P. Bender (Eds.), Mit Werkzeugen, Mathematik und Stochastik lernen - Using tools for Learning Mathematics and Statistics (pp. 405-420). Wiesbaden, Germany: Springer Spektrum.
Garfield, J., delMas, R. & Zieffler, A. (2012). Developing statistical modelers and thinkers in an introductory, tertiary-level statistics course. ZDM: The International Journal on Mathematics Education, 44 (7), 883-898. doi: 10.1007/s11858-012-0447-5.
Zieffler, A., Park, J., Garfield, J., delMas, R., Bjornsdottier, A. (2012). The Statistics Teaching Inventory: A Survey on Statistics Teachers’ Classroom Practices and Beliefs. Journal of Statistics Education, 20(1).
Zieffler, A., Garfield, J., delMas, R. C., Le, L., Isaak, R., Bjornsdottir, A. & Park, J., (2011). Publishing in SERJ: An analysis of papers from 2002-2009. Statistics Education Research Journal, 10(2). http://iase-web.org/documents/SERJ/SERJ10(2)_Zieffler.pdf
Hjalmarson, M. A., Moore, T. J. & delMas, R. (2011). Statistical analysis when the data is an image: Eliciting student thinking about sampling and variability. Statistics Education Research Journal, 10(1), 15-34. http://iase-web.org/documents/SERJ/SERJ10(1)_Hjalmarson.pdf
Garfield, J., delMas, R. & Zieffler, A. (2010). Assessing important learning outcomes in introductory tertiary statistics courses. In P. Bidgood, N. Hunt and F. Jolliffe (Eds.), Assessment Methods in Statistical Education: An International Perspective (pp. 75-86). Chichester, UK: John Wiley & Sons.
Garfield, J. & delMas, R. (2010). A website that provides resources for assessing students’ statistical literacy, reasoning, and thinking. Teaching Statistics, 32(1), 2-7.
Garfield, J., Fry, E., Zieffler, A. & delMas, R. (May, 2015). e-ATLAS: Evaluation and Assessment of Teaching and Learning About Statistics. Poster presented at the United States Conference on Teaching Statistics (USCOTS), State College, PA.
Jacobbe, T., Whitaker, D., delMas, R., Case, C., Haberstroh, J., Foti, S. & Hartlaub, B. (May, 2015). Establishing the Validity and Reliability of Assessments of Statistical Understanding. Poster presented at the United States Conference on Teaching Statistics (USCOTS), State College, PA.
Garfield, J., delMas, R., Zieffler, A., Fry, E. B., Pearl, D. (January, 2015). Evaluation and Assessment of Teaching and Learning About Statistics (e-ATLAS). Poster presented at the Joint Mathematics Meeting (JMM), San Antonio, TX.
- delMas, R. (July, 2014). Trends in students’ conceptual understanding of statistics. In K. Makar, B. de Sousa, & R. Gould (Eds.), Sustainability in statistics education. Proceedings of the Ninth International Conference on Teaching Statistics (ICOTS9, July, 2014), Flagstaff, Arizona, USA. Voorburg, The Netherlands: International Statistical Institute.http://iase-web.org/icots/9/proceedings/pdfs/ICOTS9_3C1_DELMAS.pdf
- Zieffler, A., delMas, R. C., Garfield, J. & Brown, E. (July, 2014). The symbiotic, mutualistic relationship between modeling and simulation in developing students’ statistical reasoning about inference and uncertainty. In K. Makar, B. de Sousa, & R. Gould (Eds.), Sustainability in statistics education. Proceedings of the Ninth International Conference on Teaching Statistics (ICOTS9, July, 2014), Flagstaff, Arizona, USA. Voorburg, The Netherlands: International Statistical Institute.http://iase-web.org/icots/9/proceedings/pdfs/ICOTS9_8B1_ZIEFFLER.pdf
Jacobbe, T., Haberstroh, J., delMas, R., Hartlaub, B., Whitaker, D., Case, C. & Foti, S. (April, 2014). Establishing the content validity of LOCUS through evidence centered design. Paper presented at the Annual conference of the American Educational Research Association (AERA), Philadelphia, PA.
Jacobbe, T., delMas, R., Haberstroh, J., Hartlaub, B., Whitaker, D., Case, C. & Foti, S. (April, 2014). LOCUS: A measure of students’ understanding of statistics. Poster presented at the Annual conference of the American Educational Research Association (AERA), Philadelphia, PA.
delMas, R., Fry, E., Le, L. & Sabbag, A. (May, 2013). Evaluating the Impact of Change in Curriculum and Teaching. Breakout session talk presented at the United States Conference on Teaching Statistics, Raleigh-Durham, NC.
Garfield, J., delMas, R. & Zieffler, A. (January, 2013). Collaborative Research: The CATALSTS Project, Change Agents for Teaching and Learning Statistics. Refereed poster presented at the Transforming Undergraduate Education in STEM: Building a Community to Transform Undergraduate STEM Education conference sponsored by the TUES division of the National Science Foundation, Washington, DC.
Fry, E., Garfield, J., delMas, R., & Zieffler, A. (2013). e-ATLAS: Evaluation and assessment of teaching and learning about statistics. Invited poster presented at the Joint Mathematics Meetings (JMM), San Diego, CA.