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	Instrumentvariabelmetoden (IV) för kausal inferens	Spatial Lag Model (SAR / Spatial Autoregressive)
Ämnesområde	Hälsoekonomi	Rumslig analys
Familj	Process / pipeline	Regression model
Ursprungsår	1990s (modern applications)	1988
Upphovsperson	Angrist & Pischke (applied econometrics); rooted in econometric theory	Anselin (textbook formalisation); LeSage & Pace
Typ	Method	Spatial autoregressive regression
Ursprungskälla	Angrist, J. D., & Pischke, J. S. (2009). Mostly Harmless Econometrics: An Empiricist's Companion. Princeton: Princeton University Press.	Anselin, L. (1988). Spatial Econometrics: Methods and Models. Kluwer Academic.
Alias	IV, two-stage least squares, TSLS, causal estimation	SAR model, spatial autoregressive model, spatial lag, Uzamsal Gecikme Modeli (SAR / Spatial Lag)
Närliggande	3	5
Sammanfattning	Instrumental variables (IV) is an econometric method to estimate causal effects when treatment or exposure is not randomly assigned and confounding is severe or unmeasured. IV relies on a third variable (instrument) that influences treatment but does not directly affect the outcome, allowing researchers to isolate the causal effect from the noise of confounding. Developed extensively in econometrics (Angrist & Pischke, 1990s–2000s), IV methods are increasingly used in health economics and health services research to leverage natural experiments and policy changes.	The Spatial Lag Model is an autoregressive regression that assumes spatial dependence in the dependent variable itself: the outcome values of neighbouring units enter the model as an explanatory term (ρWy). It was formalised in Anselin's Spatial Econometrics (1988) and developed further by LeSage and Pace (2009), and it decomposes spillover effects into direct, indirect, and total impacts.