Crude Oil Price Forecasting Based on Hybridizing Wavelet Multiple Linear Regression Model, Particle Swarm Optimization Techniques, and Principal Component Analysis

Table 1

Eigen value and cumulative variance contribution rate of the 8 principal components.

PC	1	2	3	4	5	6	7	8
Eigen value	1.97	1.79	1.59	1.33	0.67	0.41	0.21	0.03
Cumulative Variance Rate	0.25	0.47	0.67	0.84	0.92	0.97	1.00	1.00