Design of Partial Population Experiments with an Application to Spillovers in Tax Compliance

Guillermo Cruces (gcruces@cedlas.org), Dario Tortarolo (dtortarolo@worldbank.org) and Gonzalo Vazquez-Bare (gvazquez@econ.ucsb.edu)
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Guillermo Cruces: University of Nottingham
Dario Tortarolo: World Bank
Gonzalo Vazquez-Bare: UC Santa Barbara

No 17692, IZA Discussion Papers from Institute of Labor Economics (IZA)

Abstract: This paper develops a framework to analyze partial population experiments, a generalization of the cluster experimental design where clusters are assigned to different treatment intensities. The framework allows for heterogeneity in cluster sizes and outcome distributions. The paper studies the large-sample behavior of OLS estimators and cluster-robust variance estimators and shows that (i) ignoring cluster heterogeneity may result in severely underpowered experiments and (ii) the clusterrobust variance estimator may be upward-biased when clusters are heterogeneous. The paper derives formulas for power, minimum detectable effects, and optimal cluster assignment probabilities. All the results apply to cluster experiments, a particular case of the framework. The paper sets up a potential outcomes framework to interpret the OLS estimands as causal effects. It implements the methods in a large-scale experiment to estimate the direct and spillover effects of a communication campaign on property tax compliance. The analysis reveals an increase in tax compliance among individuals directly targeted with the mailing, as well as compliance spillovers on untreated individuals in clusters with a high proportion of treated taxpayers.

Keywords: cluster experiments; randomized controlled trials; spillovers; partial population experiments; two-stage designs; property tax; tax compliance (search for similar items in EconPapers)
JEL-codes: C01 C93 H21 H26 H71 O23 (search for similar items in EconPapers)
Pages: 81 pages
Date: 2025-02
New Economics Papers: this item is included in nep-exp
References: View references in EconPapers View complete reference list from CitEc
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Forthcoming - forthcoming in: Review of Economics and Statistics

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