Bureau of Transportation Statistics (BTS)
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Table 3 - Estimation of Rounding Model for Arrival Times

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Coefficient Maximum likelihood estimate Standard error
a5  0.900   0.00201  
b5   -0.1400   0.00127
a15  0.065   0.00165  
b15   0.0071   0.00028
a30  0.014   0.00146  
b30   0.0026   0.00014
a60 -0.00005   0.00014  
b60   0.00006   0.00002
log-likelihood -1.615.106      
log-likelihood L0 -2.252.106