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Table 1 Experimental factor setting (design 1: percentage of customers selecting a time window)

From: Using an integrated order picking-vehicle routing problem to study the impact of delivery time windows in e-commerce

Factor Factor levels
Geograpical spread (1) Clustered
(2) Random
Time window width (1) 2 h
(2) 4 h
Percentage of customers selecting a TW (1) 25%
(2) 50%
(3) 75%
(4) 100%