PT  - JOURNAL ARTICLE
AU  - Ghanem, Dalia
AU  - Hirshleifer, Sarojini
AU  - Ortiz-Beccera, Karen
TI  - Testing Attrition Bias in Field Experiments
AID  - 10.3368/jhr.0920-11190R2
DP  - 2023 Aug 11
TA  - Journal of Human Resources
PG  - 0920-11190R2
4099  - http://jhr.uwpress.org/content/early/2023/08/02/jhr.0920-11190R2.short
4100  - http://jhr.uwpress.org/content/early/2023/08/02/jhr.0920-11190R2.full
AB  - We approach attrition in field experiments with baseline data as an identification problem in a panel model. A systematic review of the literature indicates that there is no consensus on how to test for attrition bias. We establish identifying assumptions for treatment effects for both the respondents and the study population, and propose procedures to test their sharp implications. We then relate our proposed tests to current empirical practice, and demonstrate that the most commonly used test in the literature is not a test of internal validity in general. We illustrate the relevance of our analysis using several empirical applications.