Bureau of Transportation Statistics (BTS)
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Table 3
Parameter Estimates for Transborder Data

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Parameter Weight flows Value flows
Sample mean Standard deviation Sample mean Standard deviation
θ1 14.8743 1.5575 11.1739 1.1700
θ2 –21.4296 2.2439 –13.6992 1.4344
θ3 –2.1181 0.2217 –0.5534 0.0579
X 2 ratio 1.9642 0.0000 1.9012 0.0000