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Controlling for the endogeneity of peer substance use on adolescent alcohol and tobacco use


  • Edward C. Norton

    (University of North Carolina at Chapel Hill, USA)

  • Richard C. Lindrooth

    (Northwestern University and Health Research and Educational Trust, USA)

  • Susan T. Ennett

    (University of North Carolina at Chapel Hill, USA)


This study examines whether the effects of peer substance use on adolescent alcohol and tobacco use are due to endogeneity of adolescents selecting their peer group. We analyzed data collected for a longitudinal analysis of a drug-use prevention programme for upper elementary school students. We used a two-step probit regression to control for the potentially endogenous explanatory variable peer substance use. Rigorous tests of endogeneity and the validity of the instrumental variables showed that controlling for the endogeneity of peer substance use to reduce bias is not worth the reduction in mean squared error in these data. Peer substance use has a positive and significant effect on adolescent substance use for both drinking and smoking. These results imply that peer influence is empirically more important than peer selection (endogeneity) in our sample of adolescents in grades 6-9. Living in a single-parent family was by far the strongest predictor of adolescent drinking and smoking. © 1998 John Wiley & Sons, Ltd.

Suggested Citation

  • Edward C. Norton & Richard C. Lindrooth & Susan T. Ennett, 1998. "Controlling for the endogeneity of peer substance use on adolescent alcohol and tobacco use," Health Economics, John Wiley & Sons, Ltd., vol. 7(5), pages 439-453.
  • Handle: RePEc:wly:hlthec:v:7:y:1998:i:5:p:439-453
    DOI: 10.1002/(SICI)1099-1050(199808)7:5<439::AID-HEC362>3.0.CO;2-9

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