Over the last two decades, the amount and variety of data available to social scientists have dramatically increased. While in the 1990s most researchers were analyzing a handful of national surveys and government data, today's quantitative social scientists conduct their own randomized experiments and surveys and analyze a diverse array of large-scale data sets, ranging from textual to spatial data. This emerging trend demands new statistical methodologies that enable social scientists to overcome these data analytical and computational challenges.
I have developed fast and reliable computational methods for popular Bayesian models such as the multinomial probit and ecological inference models. I have also worked on the development of computational methods for lage-scale data sets in social science research. They include the fast and scalable estimation of various ideal point models for massive data, a dynamic clustering method for large scale product-level trade data, a dynamic regression model for networks, a simulation method for redistricting, and a method for record linkage with large-scale administrative data.
Machine learning and causality:
Imai, Kosuke, and Aaron Strauss. (2011). ``Estimation of Heterogeneous Treatment Effects from Randomized Experiments, with Application to the Optimal Planning of the Get-out-the-vote Campaign.'' Political Analysis, Vol. 19, No. 1 (Winter), pp. 1-19. (lead article) Winner of Political Analysis Editors' Choice Award.
Imai, Kosuke and Marc Ratkovic. (2013). ``Estimating Treatment Effect Heterogeneity in Randomized Program Evaluation.'' Annals of Applied Statistics, Vol. 7, No. 1 (March), pp. 443-470. Winner of the Tom Ten Have Memorial Award.
Egami, Naoki, and Kosuke Imai. (2018). ``Causal Interaction in Factorial Experiments: Application to Conjoint Analysis.'' Journal of the American Statistical Association, Forthcoming.
Ning, Yang, Sida Peng, and Kosuke Imai. ``High Dimensional Propensity Score Estimation via Covariate Balancing.''
Clustering and scaling methods for large-scale data:
Imai, Kosuke, James Lo, and Jonathan Olmsted. (2016). ``Fast Estimation of Ideal Points with Massive Data.'' American Political Science Review, Vol. 110, No. 4 (December), pp. 631-656.
Kim, In Song, Steven Liao, and Kosuke Imai. ``Measuring Trade Profile with Granular Product-level Trade Data.''
Olivella, Santiago, Tyler Pratt, and Kosuke Imai. ``Dynamic Stochastic Blockmodel Regression for Social Networks: Application to International Conflicts..''
Markov chain Monte Carlo methods:
Imai, Kosuke, and David A. van Dyk. (2005). ``MNP: R Package for Fitting the Multinomial Probit Model.'' Journal of Statistical Software, Vol. 14, No. 3 (May), pp. 1-32. abstract reprinted in Journal of Computational and Graphical Statistics, (2005) Vol. 14, No. 3 (September), p. 747.
Imai, Kosuke, and David A. van Dyk. (2005). ``A Bayesian Analysis of the Multinomial Probit Model Using Marginal Data Augmentation.'' Journal of Econometrics, Vol. 124, No. 2 (February), pp. 311-334.
Fifield, Benjamin, Michael Higgins, Kosuke Imai, and Alexander Tarr. ``A New Automated Redistricting Simulator Using Markov Chain Monte Carlo.''
Record linkage methods:
Enamorado, Ted, Benjamin Fifield, and Kosuke Imai. ``Using a Probabilistic Model to Assist Merging of Large-scale Administrative Records.'' American Political Science Review, Forthcoming.
Enamorado, Ted, and Kosuke Imai. ``Validating Self-reported Turnout by Linking Public Opinion Surveys with Administrative Records.''
Ecological inference models:
Imai, Kosuke, and Gary King. (2004). ``Did Illegal Overseas Absentee Ballots Decide the 2000 U.S. Presidential Election?.'' Perspectives on Politics, Vol. 2, No. 3 (September), pp.537-549. Our analysis is a part of The New York Times article, ``How Bush Took Florida: Mining the Overseas Absentee Vote'' By David Barstow and Don van Natta Jr. July 15, 2001, Page 1, Column 1.
Imai, Kosuke, Ying Lu, and Aaron Strauss. (2008). ``Bayesian and Likelihood Inference for 2 x 2 Ecological Tables: An Incomplete Data Approach.'' Political Analysis, Vol. 16, No. 1 (Winter), pp. 41-69.
Imai, Kosuke, Ying Lu, and Aaron Strauss. (2011). ``eco: R Package for Ecological Inference in 2 x 2 Tables.'' Journal of Statistical Software, Vol. 42, No. 5 (Special Volume on Political Methodology), pp. 1-23.
Imai, Kosuke and Kabir Khanna. (2016). ``Improving Ecological Inference by Predicting Individual Ethnicity from Voter Registration Record.'' Political Analysis, Vol. 24, No. 2 (Spring), pp. 263-272.
Imai, Kosuke, Ying Lu, and Aaron Strauss. ``eco: R Package for Ecological Inference in 2 x 2 Tables.'' available through The Comprehensive R Archive Network. 2004-2009.
Imai, Kosuke, and David A. van Dyk. ``MNP: R Package for Fitting the Multinomial Probit Model.'' available through The Comprehensive R Archive Network. 2004-2008.
Khanna, Kabir, and Kosuke Imai. ``wru: Who Are You? Bayesian Predictions of Racial Category Using Surname and Geolocation.'' available through GitHub. 2015.
Fifield, Benjamin, Alexander Tarr, Michael Higgins, and Kosuke Imai. ``redist: Markov Chain Monte Carlo Methods for Redistricting Simulation.'' available through The Comprehensive R Archive Network and the GitHub. 2015.
Imai, Kosuke, James Lo, and Jonathan Olmsted. ``emIRT: EM Algorithms for Estimating Item Response Theory Models.'' available through The Comprehensive R Archive Network and the GitHub. 2015.
© Kosuke Imai