방법 비교

	이질적 처치 효과 사건 연구 설계	패널 이벤트 스터디
분야	인과추론	인과추론
계열	Regression model	Regression model
기원 연도	2021	1990s–2020s (modern panel formulation)
창시자	Sun & Abraham (2021); Callaway & Sant'Anna (2021)	Formalized by Freyaldenhoven, Hansen, Perez-Orive & Shapiro (2021); widely applied in finance (Fama et al. 1969) and policy evaluation
유형	Quasi-experimental causal inference	Quasi-experimental / causal panel design
원전	Sun, L., & Abraham, S. (2021). Estimating dynamic treatment effects in event studies with heterogeneous treatment effects. Journal of Econometrics, 225(2), 175-199.	Freyaldenhoven, S., Hansen, C., Perez-Orive, J., & Shapiro, J. M. (2021). Visualization, Identification, and Estimation in the Linear Panel Event-Study Design. NBER Working Paper 29170. National Bureau of Economic Research.
별칭	HTE event study, heterogeneous effects event study, group-time ATT event study, dynamic HTE design	event-study regression, dynamic DiD, relative-time regression, distributed-lag panel model
관련	3	4
요약	Heterogeneous Treatment Effect Event Study Design is a causal-inference framework that uses event study regression to estimate how treatment effects vary across groups, cohorts, or time relative to a treatment event. Unlike classical two-way fixed-effects event studies — which assume a homogeneous effect — this approach explicitly models and recovers group-time average treatment effects (ATTs), addressing the contamination bias that arises when effects differ across treated units.	A panel event study estimates the dynamic causal effect of a treatment or policy by regressing an outcome on a full set of relative-time indicators — one for each period before and after the event — while controlling for unit and time fixed effects. The resulting coefficient plot shows how the treated units diverged from untreated units at each point in calendar time relative to their treatment date, making both pre-treatment trend violations and post-treatment effect trajectories immediately visible.