A Hybrid Approach by Integrating Brain Storm Optimization Algorithm with Grey Neural Network for Stock Index Forecasting

Table 2

Optimal parameters obtained by the BSO algorithm.

Index name	𝑏1	𝑏2	𝑏3	𝑏4	𝑏5	𝑏6
SSE Composite Index	4.6375	0.1510	3.3261	0.3365	0.5815	0.1790
Shenzhen Composite Index	4.2021	0.6432	2.2083	0.9525	−0.0108	0.3482
HuShen 300 Index	5.4745	0.2125	3.0149	1.1007	0.7272	0.4550