Σύγκριση μεθόδων

	Μοντέλο Τυχαίων Σφαλμάτων Δεδομένων Πάνελ	Μέθοδος Εργαλειακών Μεταβλητών (IV) για Αιτιώδη Συμπερασματολογία
Πεδίο	Οικονομετρία	Οικονομικά της Υγείας
Οικογένεια	Regression model	Process / pipeline
Έτος προέλευσης	2021	1990s (modern applications)
Δημιουργός	Baltagi (textbook treatment); classical random-effects panel estimator	Angrist & Pischke (applied econometrics); rooted in econometric theory
Τύπος	Panel data regression	Method
Θεμελιώδης πηγή	Baltagi, B. H. (2021). Econometric Analysis of Panel Data (6th ed.). Springer.	Angrist, J. D., & Pischke, J. S. (2009). Mostly Harmless Econometrics: An Empiricist's Companion. Princeton: Princeton University Press.
Εναλλακτικές ονομασίες	random effects panel model, RE estimator, GLS random effects, Panel Veri — Rassal Etkiler Modeli	IV, two-stage least squares, TSLS, causal estimation
Συναφείς	5	3
Σύνοψη	The Random Effects model is a panel-data regression that treats unobserved individual heterogeneity as a random component drawn from a common distribution, rather than a separate parameter for each unit. It is a standard estimator in panel econometrics, developed in textbook treatments such as Baltagi's Econometric Analysis of Panel Data (2021).	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.