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Table 2 Attraction model (import): calibration results (kg/day)

From: A demand model for international freight transport by road

Parameters (t-Student) Unit Perishable goods Industrial goods Consumption goods
β EP   435.62a (2.56) 27.28a (2.06)  
β IC (€−1) 0.03 (2.10)   354.23a (3.28)
β GDP (10−6 € inhabitants)   3,487.39a (1.95)  
β NT   466.12 (2.25)   
β PT   −1,745.42 (−1.76) −94.36 (−2.04) −3,513.04 (−2.57)
β ER     410.78a (2.42)
ρ 2   0.47 0.44 0.69
  1. aParameter value valid for natural logarithm of the correspondent attribute