Is obesity contagious?: social networks vs. environmental factors in the obesity epidemic
This note’s aim is to investigate the sensitivity of Christakis and Fowler’s claim (NEJM July 26, 2007) that obesity has spread through social networks. It is well known in the economics literature that failure to include contextual effects can lead to spurious inference on “social network effects.” We replicate the NEJM results using their specification and a complementary dataset. We find that point estimates of the “social network effect” are reduced and become statistically indistinguishable from zero once standard econometric techniques are implemented. We further note the presence of estimation bias resulting from use of an incorrectly specified dynamic model.
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- Brian Krauth, 2004.
"Simulation-based estimation of peer effects,"
- Lee, Lung-fei, 2007. "Identification and estimation of econometric models with group interactions, contextual factors and fixed effects," Journal of Econometrics, Elsevier, vol. 140(2), pages 333-374, October.
- Yann Bramoullé & Habiba Djebbari & Bernard Fortin, 2007.
"Identification of Peer Effects through Social Networks,"
Cahiers de recherche
- Bramoullé, Yann & Djebbari, Habiba & Fortin, Bernard, 2009. "Identification of peer effects through social networks," Journal of Econometrics, Elsevier, vol. 150(1), pages 41-55, May.
- Bramoullé, Yann & Djebbari, Habiba & Fortin, Bernard, 2007. "Identification of Peer Effects through Social Networks," IZA Discussion Papers 2652, Institute for the Study of Labor (IZA).
- David Cutler & Edward Glaeser & Jesse Shapiro, 2003.
"Why Have Americans Become More Obese?,"
NBER Working Papers
9446, National Bureau of Economic Research, Inc.
- Shapiro, Jesse & Glaeser, Edward & Cutler, David, 2003. "Why Have Americans Become More Obese," Scholarly Articles 2640583, Harvard University Department of Economics.
- David M. Cutler & Edward L. Glaeser & Jesse M. Shapiro, 2003. "Why Have Americans Become More Obese?," Harvard Institute of Economic Research Working Papers 1994, Harvard - Institute of Economic Research.
- Durlauf,S.N., 2003.
17, Wisconsin Madison - Social Systems.
- Charles F. Manski, 1993. "Identification of Endogenous Social Effects: The Reflection Problem," Review of Economic Studies, Oxford University Press, vol. 60(3), pages 531-542.
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