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Titel
Time spent exercising and obesity: an application of Lewbel's instrumental variables method / Charles Courtemanche (University of Kentucky, NBER and IZA), Joshua C. Pinkston (University of Louisville), Jay Stewart (Bureau of Labor Statistics and IZA) ; IZA Institute of Labor Economics
VerfasserCourtemanche, Charles ; Pinkston, Joshua C. ; Stewart, Jay Charles
KörperschaftForschungsinstitut zur Zukunft der Arbeit
ErschienenBonn, Germany : IZA Institute of Labor Economics, January 2020
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Elektronische Ressource
Umfang1 Online-Ressource (28 Seiten) : Diagramme
SerieDiscussion paper ; no. 12899
URNurn:nbn:de:hbz:5:2-210120 
Zugriffsbeschränkung
 Das Dokument ist öffentlich zugänglich im Rahmen des deutschen Urheberrechts.
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Time spent exercising and obesity: an application of Lewbel's instrumental variables method [0.61 mb]
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Zusammenfassung

This paper examines the role physical activity plays in determining body mass using data from the American Time Use Survey. Our work is the first to address the measurement error that arises when time use during a single day - rather than average daily time use over an extended period - is used as an explanatory variable. We show that failing to account for day-to-day variation in activities results in the effects of time use on a typical day being understated. Furthermore, we account for the possibility that physical activity and body mass are jointly determined by implementing Lewbel's instrumental variables estimator that exploits first-stage heteroskedasticity rather than traditional exclusion restrictions. Our results suggest that, on average, physical activity reduces body mass by less than would be predicted by simple calorie expenditure-to-weight formulas, implying compensatory behavior such as increased caloric intake.