Goldstein Helmet Study

The Effect of Motorcycle Helmet Use on the Probability
of Fatality and the Severity of Head And Neck Injuries

Table 1 - Probit Estimates of Fatality Model

Equation Constant H HI K1 K2 BA A EA EX 1 X²
1 -2.33* -1.22 0.065 0.00010* 0.067* 0.017 -0.23 -0.0033
-90.32 67.93
(-7.50) (-1.45) (0.80) (4.86) (3.49) (1.59) (-0.96) (-1.02)
2 -2.09* -1.23 0.065 0.000050* 0.077* 0.015 -0.28 -0.0018
-95.53 57.52
(-7.36) (-1.43) (0.78) (3.85) (4.31) (1.46) (-1.22) (-0.61)
t Statistics in parenthesis
* Significant at 1% level