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Clustered Local Average Treatment Effects: Fields of Study and Academic Student Progress

Author

Listed:
  • Nibbering, Didier

    (Monash University)

  • Oosterveen, Matthijs

    (University of Porto)

  • Silva, Pedro Luís

    (University of Porto)

Abstract
Multiple unordered treatments with a binary instrument for each treatment are common in policy evaluation. This multiple treatment setting allows for different types of changes in treatment status that are non-compliant with the activated instrument. Therefore, instrumental variable (IV) methods have to rely on strong assumptions on the subjects' behavior to identify local average treatment effects (LATEs). This paper introduces a new IV strategy that identifies an interpretable weighted average of LATEs under relaxed assumptions, in the presence of clusters with similar treatments. The clustered LATEs allow for shifts across treatment clusters that are consistent with preference updating, but render IV estimation of individual LATEs biased. The clustered LATEs are estimated by standard IV methods, and we provide an algorithm that estimates the treatment clusters. We empirically analyze the effect of fields of study on academic student progress, and find violations of the LATE assumptions in line with preference updating, clusters with similar fields, treatment effect heterogeneity across students, and significant differences in student progress due to fields of study.

Suggested Citation

  • Nibbering, Didier & Oosterveen, Matthijs & Silva, Pedro Luís, 2022. "Clustered Local Average Treatment Effects: Fields of Study and Academic Student Progress," IZA Discussion Papers 15159, Institute of Labor Economics (IZA).
    • Handle: RePEc:iza:izadps:dp15159
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    References listed on IDEAS

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    Cited by:

    1. Eskil Heinesen & Christian Hvid & Lars Kirkeb{o}en & Edwin Leuven & Magne Mogstad, 2022. "Instrumental variables with unordered treatments: Theory and evidence from returns to fields of study," Papers 2209.00417, arXiv.org, revised Oct 2022.
    2. Bhuller, Manudeep & Sigstad, Henrik, 2024. "2SLS with multiple treatments," Journal of Econometrics, Elsevier, vol. 242(1).

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    More about this item

    Keywords

    treatment clusters; instrumental variables; multiple treatments; field of study;
    All these keywords.

    JEL classification:

    • C36 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Instrumental Variables (IV) Estimation
    • I21 - Health, Education, and Welfare - - Education - - - Analysis of Education
    • I23 - Health, Education, and Welfare - - Education - - - Higher Education; Research Institutions

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