Is Poor Fitness Contagious? Evidence from Randomly Assigned Friends
The increase in obesity over the past thirty years has led researchers to investigate the role of social networks as a contributing factor. However, several challenges make it difficult to demonstrate a causal link between friends' physical fitness and own fitness using observational data. To overcome these problems, we exploit data from a unique setting in which individuals are randomly assigned to peer groups. We find statistically significant peer effects that are 40 to 70 percent as large as the own effect of prior fitness scores on current fitness outcomes. Evidence suggests that the effects are caused primarily by friends who were the least fit, thus supporting the provocative notion that poor physical fitness spreads on a person-to-person basis.
|Date of creation:||Nov 2010|
|Publication status:||published as Carrell, Scott E. & Hoekstra, Mark & West, James E., 2011. "Is poor fitness contagious?: Evidence from randomly assigned friends," Journal of Public Economics, Elsevier, vol. 95(7-8), pages 657-663, August.|
|Note:||ED HE LS PE|
|Contact details of provider:|| Postal: National Bureau of Economic Research, 1050 Massachusetts Avenue Cambridge, MA 02138, U.S.A.|
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- Scott E. Carrell & Frederick V. Malmstrom & James E. West, 2008. "Peer Effects in Academic Cheating," Journal of Human Resources, University of Wisconsin Press, vol. 43(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.
- Ethan Cohen-Cole & Jason M. Fletcher, 2008. "Is obesity contagious?: social networks vs. environmental factors in the obesity epidemic," Risk and Policy Analysis Unit Working Paper QAU08-2, Federal Reserve Bank of Boston.
- Stinebrickner, Ralph & Stinebrickner, Todd R., 2006.
"What can be learned about peer effects using college roommates? Evidence from new survey data and students from disadvantaged backgrounds,"
Journal of Public Economics,
Elsevier, vol. 90(8-9), pages 1435-1454, September.
- Todd R. Stinebrickner & Ralph Stinebrickner, 2005. "What Can Be Learned About Peer Effects Using College Roommates? Evidence From New Survey Data and Students from Disadvantaged Backgrounds," University of Western Ontario, Centre for Human Capital and Productivity (CHCP) Working Papers 20054, University of Western Ontario, Centre for Human Capital and Productivity (CHCP).
- Scott E. Carrell & Richard L. Fullerton & James E. West, 2009.
"Does Your Cohort Matter? Measuring Peer Effects in College Achievement,"
Journal of Labor Economics,
University of Chicago Press, vol. 27(3), pages 439-464, July.
- Scott E. Carrell & Richard L. Fullerton & James E. West, 2008. "Does Your Cohort Matter? Measuring Peer Effects in College Achievement," NBER Working Papers 14032, National Bureau of Economic Research, Inc.
- David S. Lyle, 2007. "Estimating and Interpreting Peer and Role Model Effects from Randomly Assigned Social Groups at West Point," The Review of Economics and Statistics, MIT Press, vol. 89(2), pages 289-299, May.
- David J. Zimmerman, 2003.
"Peer Effects in Academic Outcomes: Evidence from a Natural Experiment,"
The Review of Economics and Statistics,
MIT Press, vol. 85(1), pages 9-23, February.
- Zimmerman, David J., 1999. "Peer Effects in Academic Outcomes: Evidence From a Natural Experiment," Williams Project on the Economics of Higher Education DP-52, Department of Economics, Williams College.
- 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.
- Manski, C.F., 1991. "Identification of Endogenous Social Effects: the Reflection Problem," Working papers 9127, Wisconsin Madison - Social Systems.
- Bruce Sacerdote, 2001.
"Peer Effects with Random Assignment: Results for Dartmouth Roommates,"
The Quarterly Journal of Economics,
Oxford University Press, vol. 116(2), pages 681-704.
- Bruce Sacerdote, 2000. "Peer Effects with Random Assignment: Results for Dartmouth Roommates," NBER Working Papers 7469, National Bureau of Economic Research, Inc.
- Burkhauser, Richard V. & Cawley, John, 2008.
"Beyond BMI: The value of more accurate measures of fatness and obesity in social science research,"
Journal of Health Economics,
Elsevier, vol. 27(2), pages 519-529, March.
- John Cawley & Richard V. Burkhauser, 2006. "Beyond BMI: The Value of More Accurate Measures of Fatness and Obesity in Social Science Research," NBER Working Papers 12291, National Bureau of Economic Research, Inc.
- Michael Kremer & Dan Levy, 2008. "Peer Effects and Alcohol Use among College Students," Journal of Economic Perspectives, American Economic Association, vol. 22(3), pages 189-206, Summer.
- Foster, Gigi, 2006. "It's not your peers, and it's not your friends: Some progress toward understanding the educational peer effect mechanism," Journal of Public Economics, Elsevier, vol. 90(8-9), pages 1455-1475, September.
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