Matching Methods for Causal Inference with Time-Series Cross-Sectional Data

Kosuke Imai, In Song Kim, Erik H. Wang

    Research output: Contribution to journalArticlepeer-review


    Matching methods improve the validity of causal inference by reducing model dependence and offering intuitive diagnostics. Although they have become a part of the standard tool kit across disciplines, matching methods are rarely used when analysing time-series cross-sectional data. We fill this methodological gap. In the proposed approach, we first match each treated observation with control observations from other units in the same time period that have an identical treatment history up to the prespecified number of lags. We use standard matching and weighting methods to further refine this matched set so that the treated and matched control observations have similar covariate values. Assessing the quality of matches is done by examining covariate balance. Finally, we estimate both short-term and long-term average treatment effects using the difference-in-differences estimator, accounting for a time trend. We illustrate the proposed methodology through simulation and empirical studies. An open-source software package is available for implementing the proposed methods.

    Original languageEnglish (US)
    Pages (from-to)587-605
    Number of pages19
    JournalAmerican Journal of Political Science
    Issue number3
    StatePublished - Jul 2023

    ASJC Scopus subject areas

    • Sociology and Political Science
    • Political Science and International Relations


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