Structure Optimization of Safety Investment of Petrochemical Port Enterprises

Table 2

Coefficients of Gompertz curve.

Incident code	ci	ai	bi
x1	0.070	0.950	1.070
x2	0.003	0.398	1.009
x3	0.080	0.110	1.011
x4	0.040	0.150	5.010