Adjunct member

Yoko Ibuka< back to the list

Professor, Faculty of Economics, Keio University


Yoko Ibuka is a professor of economics at Keio University, Tokyo, Japan. She is interested in a broad range of topics in health economics, focusing on understanding health-related behavior and exploring effective and/or efficient public health policies. Her expertise includes conducting empirical analyses on individual and group decision making on interventions against infectious diseases and the evaluation of public health policies. Her recent research also extends to the estimation of health expenditures in Japan using administrative data to shed light on the micro-level structure of healthcare costs.

She obtained a BA and an MA in Economics from Keio University, and a Ph. D. in Economics from Rutgers, the State University of New Jersey. Prior to joining Keio, she held the following positions: as postdoctoral researcher at the Yale School of Public Health, assistant professor at Hitotsubashi University, and associate professor at Kyoto and Tohoku Universities. She has published papers in Health Economics, Health Affairs, Fiscal Studies, Journal of Epidemiology and Community Health, and Medical Care, among others.

【Recent Publication】
  • Ibuka, Y., Y. Matsuda, K. Shoji, T. Ishigaki, "Evaluation of regional variations in healthcare utilization." Japanese Journal of Statistics and Data Science 2020, 3, 349-365, 2020.
  • Bessho, S., and Y. Ibuka, “Interdependency in Vaccination Policies among Japanese Municipalities,” Health Economics, 28(2), 299-310,2019.
  • French, E.B., J. McCauley, M. Aragon, P. Bakx, M. Chalkley, S. H. Chen, B. J. Christensen, H. Chuang, A. Côté-Sergent, M. De Nardi, E. Fan, D. Échevin, P-Y. Geoffard, C. Gastaldi-Ménager, M. Gørtz, Y. Ibuka, J. B. Jones, M. Kallestrup-Lamb, M. Karlsson, T. J. Klein, G. de Lagasnerie, P-C. Michaud, O. O'Donnell, N. Rice, J. S. Skinner, E. van Doorslaer, N. R. Ziebarth and E. Kelly, "End-Of-Life Medical Spending In Last Twelve Months Of Life Is Lower Than Previously Reported," Health Affairs, 36(7), 1211-1217, 2017.
  • Ibuka, Y., S. H. Chen, Y. Ohtsu, and N. Izumida, “Medical Spending in Japan: An Analysis Using Administrative Data from A Citizen’s Health Insurance Plan,” Fiscal Studies, 37(3-4), 561-592, 2016.
  • Ibuka, Y., and S. Bessho, “Out-of-pocket Payments and Community-wide Health Outcomes: An Examination of Influenza Vaccination Subsidies in Japan,” Health Economics, Policy and Law, 11(3): 275-302, 2016.
  • Ibuka, Y, Y Ohkusa, T Sugawara, G.B. Chapman, D. Yamin, K.E. Atkins, K. Taniguchi, N. Okabe, and A.P. Galvani, “Social Contacts, Vaccination Decisions and Influenza in Japan,”Journal of Epidemiology and Community Health, 70(2), 162-167, 2016.
  • Ibuka, Y., M. Li, J.T. Vietri, G.B. Chapman, and A.P. Galvani, “Free-riding Behavior in Vaccination Decisions: An Experimental Study,” PLoS One, 9(1), e87164, 2014.
  • Durham, D. P., E.M. Poolman, Y. Ibuka, J.P. Townsend, and A.P. Galvani, “Reevaluation of Epidemiological Data Demonstrates that It Is Consistent with Cross-immunity among Human Papillomavirus Types,” The Journal of Infectious Diseases, 206(8), 1291-1298, 2012.
  • Ibuka, Y., A. D. Paltiel, and A. P. Galvani, “Impact of Program Scale and Indirect Effects on the Cost-effectiveness of Vaccination Programs” Medical Decision Making, 32(3), 442-446, 2012.
  • Chapman, G. B., M. LI, J. T. Vietri, Y. Ibuka, D. Thomas, H. Yoon, and A.P. Galvani, “Using Game Theory to Examine Incentives in Influenza Vaccination Behavior,” Psychological Science, 23(9), 1008-1015, 2012.
  • Carr, D., Y Ibuka, and L. B. Russell, "How Much Time Do Americans Spend Seeking Health Care? Racial and Ethnic Differences in Patient Experiences," Research in the Sociology of Health Care 2010, The Impact of Demographics on Health and Health Care: Ethnicity and Other Social Factors; 28:71-98, 2010.
  • Lund, J. L., K. R. Yabroff, Y. Ibuka, L. B. Russell, P. G. Barnett, J. Lipscomb, W. F. Lawrence, and M. L. Brown, "Appendix. Inventory of Data Sources for Estimating Health Care Costs in the United States" Medical Care, Supplement 1 2009, Health Care Costs: Data, Methods, Future Directions; 47(7), S127-142, 2009.
  • Russell, L. B., Y. Ibuka, and K. G. Abraham, "Health-Related Activities in the American Time Use Survey" Medical Care, 45(7), 680-685, 2007.