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A Vector Monotonicity Assumption for Multiple Instruments

Leonard Goff

arXiv 1 Sep 2020 · Econometrics · publishedJournal of Econometrics (2024) · 7 citations (OpenAlex)

arXiv:2009.00553 · PDF · DOI · OpenAlex · Extracted main text

Abstract

When a researcher combines multiple instrumental variables for a single binary treatment, the monotonicity assumption of the local average treatment effects (LATE) framework can become restrictive: it requires that all units share a common direction of response even when separate instruments are shifted in opposing directions. What I call vector monotonicity, by contrast, simply assumes treatment uptake to be monotonic in all instruments. I characterize the class of causal parameters that are point identified under vector monotonicity, when the instruments are binary. This class includes, for example, the average treatment effect among units that are in any way responsive to the collection of instruments, or those that are responsive to a given subset of them. The identification results are constructive and yield a simple estimator for the identified treatment effect parameters. An empirical application revisits the labor market returns to college.

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Most heavily cited references

The works this paper leans on most, across its whole bibliography — not restricted to papers in our corpus. Ranked by composite intensity, which combines how often a work is mentioned, how many sections mention it, and how much of that falls in the main text rather than the appendix.

ReferenceIntensityMentionsSectionsMain text
1Imbens, Guido W, Angrist, Joshua D (1994) Identification and Estimation of Local Average Treatment Effects1.00065100%
2Heckman, James J, Vytlacil, Edward (2005) Structural Equations, Treatment Effects, and Econometric Policy Evaluation0.64422100%
3Mogstad, Magne, Santos, Andres, Torgovitsky, Alexander (2018) Using Instrumental Variables for Inference About Policy Relevant Treatment Parameters0.5113233%
4(2007) Nonparametric IV estimation of local average treatment effects with covariates0.5112250%
5Mogstad, Magne, Torgovitsky, Alexander, Walters, Christopher (2022) Policy Evaluation with Multiple Instrumental Variables0.5112250%
6Kisielewicz, A (1988) A solution of Dedekind's problem on the number of isotone Boolean functions.0.51121100%
7Anderson, Ian (1987) Combinatorics of finite sets0.40511100%
8Angrist, Joshua D (2008) Mostly Harmless Econometrics0.40511100%
9Carneiro, Pedro, Heckman, James J., Vytlacil, Edward J (2011) Estimating marginal returns to education0.40511100%
10Heckman, James J., Pinto, Rodrigo (2018) Unordered Monotonicity0.40511100%

Showing the top 10 of 20 scored citations.

Cited by, within the corpus

arXiv econ.EM papers that cite this one, ranked by how heavily they lean on it.

Citing paperIntensityMentionsSections
12.5cm Identification and Inference with Machine-Learned Instruments0.87482
2On the falsification of instrumental variable models for heterogeneous treatment effects0.73733
3When does IV identification not restrict outcomes?0.48194
4Treatment Effects with Targeting Instruments0.40511
5Pairwise Valid Instruments0.40511
62SLS with Multiple Treatments0.40511
7Policy Relevant Treatment Effects with Multidimensional Unobserved Heterogeneity0.40511
8Dynamic Local Average Treatment Effects0.40511
9Sharp Testable Implications of Encouragement Designs0.40511
10Causal Inference for Qualitative Outcomes0.40511