The demand for sleep: A South African study
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- Newey, Whitney K & Powell, James L & Walker, James R, 1990.
"Semiparametric Estimation of Selection Models: Some Empirical Results,"
American Economic Review,
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- Newey, W.K. & Powell, J.L. & Walker, J.R., 1990. "Semiparametric Estimation Of Selection Models: Some Empirical Results," Working papers 9001, Wisconsin Madison - Social Systems.
- Darren Lubotsky & Martin Wittenberg, 2006.
"Interpretation of Regressions with Multiple Proxies,"
The Review of Economics and Statistics,
MIT Press, vol. 88(3), pages 549-562, August.
- Darren Lubotsky & Martin Wittenberg, 2001. "Interpretation of Regressions with Multiple Proxies," Econometrics 0110005, EconWPA.
- Heckman, James J, 1990. "Varieties of Selection Bias," American Economic Review, American Economic Association, vol. 80(2), pages 313-18, May.
- James J. Heckman & Thomas E. Macurdy, 1980. "A Life Cycle Model of Female Labour Supply," Review of Economic Studies, Oxford University Press, vol. 47(1), pages 47-74.
- Jeff E. Biddle & Daniel S. Hamermesh, 1989.
"Sleep and the Allocation of Time,"
NBER Working Papers
2988, National Bureau of Economic Research, Inc.
- Martin Wittenberg, 2005. "The school day in South Africa," SALDRU/CSSR Working Papers 113, Southern Africa Labour and Development Research Unit, University of Cape Town.
- Michael, Robert T, 1973. "Education in Nonmarket Production," Journal of Political Economy, University of Chicago Press, vol. 81(2), pages 306-27, Part I, M.
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