Table 2.

Nonlinear factor screening process and MSE values.

Screening rounds	Baseline MSE	x 1	x 2	x 3	x 4	x 5	x 6	x 7	x 8	Excluded factors
1	24.42	23.20	22.29	22.47	22.43	21.51	22.10	21.47	22.14	x 7
2	21.47	22.20	21.72	22.60	22.84	19.97	21.36	-	21.31	x 5
3	19.97	20.81	20.02	21.15	22.41	-	21.16	-	20.80	-