Linearity in Instrumental Variables Estimation: Problems and Solutions
The linear IV estimator, in which the dependent variable is a linear function of a potentially endogenous regressor, is a major workhorse in empirical economics. When this regressor takes on multiple values, the linear specification restricts the marginal effects to be constant across all margins. This paper investigates the problems caused by the linearity restriction in IV estimation, and discusses possible remedies. We first examine the biases due to nonlinearity in the commonly used tests for non-zero treatment effects, selection bias, and instrument validity. Next, we consider three applications where theory suggests a nonlinear relationship, yet previous research has used linear IV estimators. We find that relaxing the linearity restriction in the IV estimation changes the qualitative conclusions about the relevant economic theory and the effectiveness of different policies.
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- Katrine V. Løken & Magne Mogstad & Matthew Wiswall, 2012.
"What Linear Estimators Miss: The Effects of Family Income on Child Outcomes,"
American Economic Journal: Applied Economics,
American Economic Association, vol. 4(2), pages 1-35, April.
- Loken, Katrine Vellesen & Mogstad, Magne & Wiswall, Matthew, 2010. "What Linear Estimators Miss: Re-Examining the Effects of Family Income on Child Outcomes," IZA Discussion Papers 4971, Institute for the Study of Labor (IZA).
- Løken, Katrine Vellesen & Mogstad, Magne & Wiswall, Matthew, 2011. "What Linear Estimators Miss: The E ects of Family Income on Child Outcomes," Working Papers in Economics 02/11, University of Bergen, Department of Economics.
- Julio Cáceres-Delpiano, 2006. "The Impacts of Family Size on Investment in Child Quality," Journal of Human Resources, University of Wisconsin Press, vol. 41(4).
- Philip Oreopoulos & Marianne Page & Ann Huff Stevens, 2008. "The Intergenerational Effects of Worker Displacement," Journal of Labor Economics, University of Chicago Press, vol. 26(3), pages 455-483, 07.
- Ann Huff Stevens & Marianne Page & Philip Oreopoulos, 2005. "The Intergenerational Effects of Worker Displacement," Working Papers 521, University of California, Davis, Department of Economics.
- Philip Oreopoulos & Marianne Page & Ann Huff Stevens, 2005. "The Intergenerational Effect of Worker Displacement," NBER Working Papers 11587, National Bureau of Economic Research, Inc.
- Philip Oreopolous & Marianne Page & Ann Huff Stevens, 2005. "The Intergenerational Effects Of Worker Displacement," Working Papers id:183, eSocialSciences.