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Identifying Individual and Group Effects in the Presence of Sorting: A Neighborhood Effects Application

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Date
2006
Authors
Bayer, P
Ross, S
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Abstract
Researchers have long recognized that the non-random sorting of individuals into groups generates correlation between individual and group attributes that is likely to bias naïve estimates of both individual and group effects. This paper proposes a non-parametric strategy for identifying these effects in a model that allows for both individual and group unobservables, applying this strategy to the estimation of neighborhood effects on labor market outcomes. The first part of this strategy is guided by a robust feature of the equilibrium in vertical sorting models - a monotonic relationship between neighborhood housing prices and neighborhood quality. This implies that under certain conditions a non-parametric function of neighborhood housing prices serves as a suitable control function for the neighborhood unobservable in the labor market outcome regression. This control function transforms the problem to a model with one unobservable so that traditional instrumental variables solutions may be applied. In our application, we instrument for each individuals observed neighborhood attributes with the average neighborhood attributes of a set of observationally identical individuals. The neighborhood effects model is estimated using confidential microdata from the 1990 Decennial Census for the Boston MSA. The results imply that the direct effects of geographic proximity to jobs, neighborhood poverty rates, and average neighborhood education are substantially larger than the conditional correlations identified using OLS, although the net effect of neighborhood quality on labor market outcomes remains small. These findings are robust across a wide variety of specifications and robustness checks.
Type
Journal article
Subject
sorting
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https://hdl.handle.net/10161/2012
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Scholars@Duke

Bayer

Patrick Bayer

Gilhuly Family Distinguished Professor in Economics
Bayer's research focuses on wide range of subjects including racial inequality and segregation, social interactions, housing markets, education, and criminal justice. His most recent work has been published in the Quarterly Journal of Economics, American Economic Review, Econometrica, and the Review of Financial Studies. He is currently working on projects that examine jury representation and its consequences, the intergenerational consequences of residential and school segregation, neighborhood
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