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Why and When "Flawed" Social Network Analyses Still Yield Valid Tests of no Contagion

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  • VanderWeele Tyler J.

    (Harvard University)

  • Ogburn Elizabeth L.

    (Harvard University)

  • Tchetgen Tchetgen Eric J.

    (Harvard University)

Abstract

Lyons (2011) offered several critiques of the social network analyses of Christakis and Fowler, including issues of confounding, model inconsistency, and statistical dependence in networks. Here we show that in some settings, social network analyses of the type employed by Christakis and Fowler will still yield valid tests of the null of no social contagion, even though estimates and confidence intervals may not be valid. In particular, we show that if the alter's state is lagged by an additional period, then under the null of no contagion, the problems of model inconsistency and statistical dependence effectively disappear which allow for testing for contagion. Our results clarify the setting in which even "flawed" social network analyses are still useful for assessing social contagion and social influence.

Suggested Citation

  • VanderWeele Tyler J. & Ogburn Elizabeth L. & Tchetgen Tchetgen Eric J., 2012. "Why and When "Flawed" Social Network Analyses Still Yield Valid Tests of no Contagion," Statistics, Politics and Policy, De Gruyter, vol. 3(1), pages 1-13, February.
    • Handle: RePEc:bpj:statpp:v:3:y:2012:i:1:p:13:n:5
    DOI: 10.1515/2151-7509.1050
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    References listed on IDEAS

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    1. Cohen-Cole, Ethan & Fletcher, Jason M., 2008. "Is obesity contagious? Social networks vs. environmental factors in the obesity epidemic," Journal of Health Economics, Elsevier, vol. 27(5), pages 1382-1387, September.
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    Cited by:

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    2. Chih‐Sheng Hsieh & Hans van Kippersluis, 2018. "Smoking initiation: Peers and personality," Quantitative Economics, Econometric Society, vol. 9(2), pages 825-863, July.
    3. Valente, Thomas W. & Dyal, Stephanie R. & Chu, Kar-Hai & Wipfli, Heather & Fujimoto, Kayo, 2015. "Diffusion of innovations theory applied to global tobacco control treaty ratification," Social Science & Medicine, Elsevier, vol. 145(C), pages 89-97.

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