2025-10-07 マサチューセッツ大学アマースト校（UMass）
Web要約 の発言：
＜関連情報＞
- https://www.umass.edu/news/article/questionable-lead-reporting-drinking-water-virtually-vanished-after-flint-water-crisis
- https://www.aeaweb.org/articles?id=10.1257/aeri.20240258
四捨五入の存在下での閾値操作の定量化：米国の飲料水における鉛モニタリングの事例 Quantifying Threshold Manipulation in the Presence of Rounding: The Case of Lead Monitoring in US Drinking Water
Tihitina Andarge,Dalia Ghanem,David A. Keiser,Gabriel E. Lade
American Economic Review: Insights Published:September 2025
DOI: 10.1257/aeri.20240258
Abstract
Many laws and economic actions depend on thresholds. As a consequence, threshold manipulation is a common concern in a variety of settings. Existing methods for detecting and quantifying threshold manipulation assume a continuous counterfactual distribution absent manipulation. This assumption is violated in the presence of rounding, which is prevalent in many applications and distinct from manipulation. This paper develops methods for testing and quantifying threshold manipulation when rounding is a prominent feature of the data. We demonstrate the usefulness of our approach in an empirical application examining threshold manipulation in lead monitoring under the US Safe Drinking Water Act.
