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. Author manuscript; available in PMC: 2009 May 1.
Published in final edited form as: J Health Econ. 2007 Dec 4;27(3):531–543. doi: 10.1016/j.jhealeco.2007.09.009

Table 4.

First Stage OLS Estimates of Auxiliary Regression in the Re-Analysis of Mullahy’s Birthweight Model

Variable Estimate t-stat
CONSTANT 6.74 6.49
PARITY 0.30 1.72
WHITE 0.78 1.89
MALE −0.04 −0.13
EDFATHER −0.12 −3.14
EDMOTHER −0.33 −4.37
FAMINCOM −0.02 −2.01
CIGTAX88 0.03 1.43

Second column gives estimates of the elements of α in xe = wα + xu