Gender Peer Effects Heterogeneity in Obesity

CRREP working paper serie 2017-02

41 Pages Posted: 22 May 2018 Last revised: 16 Jul 2018

See all articles by Rokhaya Dieye

Rokhaya Dieye

Université Laval

Bernard Fortin

Université Laval - Département d'Économique; National Bureau of Economic Research (NBER); IZA Institute of Labor Economics

Date Written: January 1, 2017


This paper explores gender peer effects heterogeneity in adolescent Body Mass Index (BMI). We propose a utility-based non-cooperative social network model with effort technology. We allow the gender composition to influence peer effects. We analyze the possibility of recovering the fundamentals of our structural model from the best-response functions. We provide identification conditions of these functions generalizing those of the homogeneous version of the model. Extending Liu and Lee [2010], we consider 2SLS and GMM strategies to estimate our model using Add Health data. We provide tests of homophily in the formation of network and reject them after controlling for network (school) fixed effects. The joint (endogenous plus contextual) gender homogeneous model is rejected. However, we do not reject that the endogenous effects are the same.This suggests that the source of gender peer effects heterogeneity is the contextual effects. We find that peers’ age, parents’ education, health status, and race are relevant for the latter effects and are gender-dependent.

Keywords: Obesity, Social Networks, Peer effects, Heterogeneity, Gender, Identification, Add Health

JEL Classification: L12, C31, Z13, D85

Suggested Citation

Dieye, Rokhaya and Fortin, Bernard, Gender Peer Effects Heterogeneity in Obesity (January 1, 2017). CRREP working paper serie 2017-02, Available at SSRN: or

Rokhaya Dieye (Contact Author)

Université Laval ( email )

2214 Pavillon J-A. DeSeve
Quebec, Quebec G1K 7P4

Bernard Fortin

Université Laval - Département d'Économique ( email )

2325 Rue de l'Université
Ste-Foy, Quebec G1K 7P4 G1K 7P4
418-656-5678 (Phone)
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National Bureau of Economic Research (NBER)

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IZA Institute of Labor Economics

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