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	Heterogen Behandlings-effekt Interrupted Time Series (HTE-ITS)	Differens-i-differens (DiD)
Ämnesområde	Kausal inferens	Ekonometri
Familj	Regression model	Regression model
Ursprungsår	2000s–2010s	1994
Upphovsperson	Extensions of Shadish, Cook & Campbell (2002) ITS framework; HTE formulation developed by Lopez Bernal and colleagues	Card & Krueger (canonical 1994 application); Angrist & Pischke (textbook treatment)
Typ	Quasi-experimental segmented regression with subgroup moderation	Causal inference / panel regression
Ursprungskälla	Lopez Bernal, J., 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.	Angrist, J. D., & Pischke, J.-S. (2009). Mostly Harmless Econometrics: An Empiricist's Companion. Princeton University Press. ISBN: 978-0691120355
Alias	HTE-ITS, Subgroup ITS, Effect-modifier ITS, Segmented ITS with interaction	diff-in-diff, DiD, Farkların Farkı (Diff-in-Diff)
Närliggande	4	5
Sammanfattning	Heterogeneous Treatment Effect Interrupted Time Series extends the standard ITS design to detect whether an intervention's effect on a time series differs systematically across subgroups or in response to unit-level moderators. Where ordinary ITS yields a single level-change and slope-change estimate, HTE-ITS adds interaction terms for a moderating variable, revealing who benefits more or less from the intervention and by how much.	Difference-in-Differences is a causal-inference method that estimates the effect of an intervention by comparing how a treatment group and a control group change over time. Made famous by Card and Krueger's 1994 minimum-wage study and developed in Angrist and Pischke's Mostly Harmless Econometrics, it isolates the treatment effect as the difference between the two groups' before-after changes.