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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 5.

Estimation Results B IBC Version of Mullahy=s Birthweight Model

2SPS IBC 2SRI IBC
Variable Coeff t-stat Coeff t-stat
CONSTANT 58.96 22.07 1.27 215.33
CIGSPREG −1.92 −3.47 −0.004 −3.52
PARITY 3.23 3.26 0.01 3.39
WHITE 9.64 4.85 0.02 4.64
MALE 4.64 2.81 0.01 2.93
First-stage Residual (xu) B B 0.024 2.03
Box-Cox 5.20 B −0.95 B
Parameter τ E[y0]− E[y20] 1.85 1.41

Second and fourth columns, respectively, give the estimates of the parameters in equations (18) and (19). Last row shows the 2SPS and 2SRI estimated effects of an exogenously imposed one-pack per day reduction in smoking, respectively.