Research on Parameter Optimization of the Express Warehousing and Distribution System Based on the Box–Behnken Response Surface Methodology

Table 1

Factors and levels.

Factor	Variable	Level
		−1	0	1
Sorting speed (D/PCS)	A	0.001	0.0055	0.01
Delivery speed (M/D)	B	20	30	40
Capacity of sorting temporary storage area (PCS)	C	200	400	600
Distribution staging area capacity (PCS)	D	200	300	400