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European Transport Research Review

An Open Access Journal

Table 2 Experimental factor setting (design 2: number of orders)

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

Number of orders

(1) 50

(2) 100

(3) 150

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