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| Οικονομετρία Δικτύων (Επιδράσεις Ομοτίμων)× | Μοντέλο Χωρικής Υστέρησης (SAR / Χωρικό Αυτοπαλίνδρομο)× | |
|---|---|---|
| Πεδίο≠ | Οικονομετρία | Χωρική Ανάλυση |
| Οικογένεια | Regression model | Regression model |
| Έτος προέλευσης≠ | 2009 | 1988 |
| Δημιουργός≠ | Yann Bramoullé, Habiba Djebbari & Bernard Fortin | Anselin (textbook formalisation); LeSage & Pace |
| Τύπος≠ | Linear-in-means peer effects regression | Spatial autoregressive regression |
| Θεμελιώδης πηγή≠ | Bramoullé, Y., Djebbari, H., & Fortin, B. (2009). Identification of peer effects through social networks. Journal of Econometrics, 150(1), 41–55. DOI ↗ | Anselin, L. (1988). Spatial Econometrics: Methods and Models. Kluwer Academic. DOI ↗ |
| Εναλλακτικές ονομασίες | Social Interactions Model, Peer Effects Model, Social Network Regression, Ağ Ekonometrisi | SAR model, spatial autoregressive model, spatial lag, Uzamsal Gecikme Modeli (SAR / Spatial Lag) |
| Συναφείς≠ | 3 | 5 |
| Σύνοψη≠ | Network econometrics estimates how individuals' outcomes are causally shaped by the behaviour and characteristics of their social-network neighbours. Formalised by Bramoullé, Djebbari, and Fortin (2009), the framework embeds a row-normalised adjacency matrix into a linear regression, separating endogenous peer effects (imitation of outcomes), exogenous contextual effects (influence of neighbours' attributes), and correlated effects (shared environment), while using network topology to construct valid instruments. | 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. |
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