Senior Engineer

Ian Yohai provides expertise in the quantitative modeling of social science data. He specializes in statistical analysis, especially applied to political, social, cultural, or economic problems. Dr. Yohai has wide familiarity with methods for causal inference, missing data, multilevel modeling, and the analysis of survey data. In addition, he also has extensive experience in public opinion research and methodology.

Dr. Yohai earned a Ph.D. and A.M. in Political Science from Harvard University and an A.B. in Politics from Princeton University. He is a member of the American Political Science Association (APSA) and the American Association for Public Opinion Research (AAPOR).

Publications

Yohai, I., Riordan, B., & Duchon, A. (2012).  Discovering entity characteristics and relationships through topic modeling. Proceedings of the 4th International Conference on Applied Human Factors and Ergonomics (AHFE 2012), San Francisco, California.

Duchon, A., McCormack, R., Riordan, B., Shabarekh, C., Weil, S., & Yohai, I., (2011). Analysis of C2 and “C2-Lite” micro-message communications. 2011 AAAI Workshop on Microtext. San Francisco, CA.

McCormack, R., Yohai, I., Duchon, A., Freeman, J., Skarin, B., Pfautz, S., & Salter, W. (2011). Assessing opinion change through the integration of agent-basedmodels and natural language processing. HSCB Focus 2011, 8-10 February 2011, Chantilly, VA.

Shabarekh, C., Yohai, I., & Riordan, B. (2011). A data-driven approach to ontology discovery. Proceedings of the Interservice/Industry Training, Simulation, and Education Conference (I/ITSEC). Arlington, Virginia.

Salter, W., Yohai, I., Levchuk, G., & Skarin B. (2010). Data problems for cross-cultural decision making. Proceedings of the 1st International Conference on Cross-Cultural Decision Making, Miami, FL.

Schlozman, D., & Yohai, I. (2008). How initiatives don’t make citizens: Ballot initiatives in the American states, 1978-2004. Political Behavior, 30(4), 469-489.

Yohai, I. (2008). Mass opinion and party positions on immigration and trade in the United States. Presented at the Annual Meeting of the American Political Science Association.

Berinsky, A., Schickler, E., Powell, E., & Yohai, I. (2008). Revisiting public opinion in the 1930s and 1940s. Presented at the Annual Meeting of the American Political Science Association.

Yohai, I. (2003) Changing the lines: Race and redistricting in New Jersey. Journal of Politics and Society, XV, 51-68.

For more information about Dr. Yohai’s publications, please contact aptima_info@aptima.com.