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BTS Home > Publications > Journal of Transportation and Statistics > Volume 5 Number 1 > Paper 4
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Table 3 - One-Way SUR Model for Per Capita Sales in Gasoline Service Stations

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  Initial specification Final specification
Coefficient t-stat Coefficient t-stat
CONSTANT 4.45E+04 4.56 3.81E+04 6.05
STATE SALES PERCAP 3.04E+00 5.16 3.01E+00 7.1
YEAR -2.33E+01 -4.54 -1.99E+01 -6.04
YEAR 1982 -3.89E+02 -4.55 -3.92E+02 -4.76
ELDERLY 4.64E+00 0.55    
UNEMP RATE 1.11E+01 0.76    
INCOME PERCAP 2.09E-02 0.99    
LARGECITY POP/DIST -1.46E-03 -0.27    
TOT TRAFFIC PERCAP 2.95E+02 8.04 2.97E+02 8.72
RELIEF ROUTE -2.80E+01 -0.06 -8.83E+01 -0.46
NUM YEARS -2.18E+01 -0.92    
NUM YEARS SQ 7.98E-01 0.86    
TRAFFIC SPLIT -4.20E+02 -0.86 -7.57E+02 -1.91
DIST OLD 2.12E+01 0.55    
DIST RATIO -1.58E+02 -0.36    
ACCESS CONTROL -1.41E+02 -0.97    
R2adj. 0.30   0.31  
σ2μ 5.31E+04   5.82E+04  
σ2ν 1.75E+05   1.73E+05  
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