เปรียบเทียบวิธี

	การวิเคราะห์ผลกระทบเชิงสาเหตุแบบหลายช่วงเวลา	การวิเคราะห์อนุกรมเวลาแบบขัดจังหวะ (Interrupted Time Series - ITS)
สาขาวิชา	การอนุมานเชิงสาเหตุ	การอนุมานเชิงสาเหตุ
ตระกูล	Regression model	Regression model
ปีกำเนิด	2015 (base); multi-period extensions 2017–present	2002
ผู้ริเริ่ม	Brodersen, Gallusser, Koehler, Remy & Scott (Google); extended to multi-period settings by subsequent applied work	Wagner, Soumerai, Zhang & Ross-Degnan (segmented regression); Bernal, Cummins & Gasparrini (tutorial)
ประเภท	Bayesian structural time-series / quasi-experimental	Quasi-experimental segmented regression
แหล่งต้นตำรับ	Brodersen, K. H., Gallusser, F., Koehler, J., Remy, N., & Scott, S. L. (2015). Inferring causal impact using Bayesian structural time-series models. Annals of Applied Statistics, 9(1), 247-274.	Bernal, J. L., Cummins, S., & Gasparrini, A. (2017). Interrupted time series regression for the evaluation of public health interventions: a tutorial. International Journal of Epidemiology, 46(1), 348-355.
ชื่อเรียกอื่น	multi-period CausalImpact, staggered causal impact, repeated-period causal impact, multi-wave CausalImpact	ITS analysis, segmented regression of time series, Kesintili Zaman Serisi (ITS) Analizi
ที่เกี่ยวข้อง	6	5
สรุป	Multi-period Causal Impact Analysis extends the Bayesian structural time-series framework of Brodersen et al. (2015) to settings where an intervention occurs across multiple distinct periods, is applied at staggered times to different units, or where researchers wish to evaluate cumulative and period-specific effects within a single unified model. It builds a synthetic counterfactual from control covariates and projects it across each intervention window to quantify causal effects.	Interrupted Time Series analysis is a quasi-experimental design that estimates the effect of a single, well-dated intervention by comparing the trajectory of an outcome before and after it occurs. Formalised as segmented regression by Wagner and colleagues (2002) and popularised as a public-health evaluation tutorial by Bernal, Cummins and Gasparrini (2017), it separates the intervention's impact into a change in level and a change in slope.