Frequencies for first 10,000 rows of rail variable in accident dataset :

  RAIL XING |
         ID |      Freq.     Percent        Cum.
------------+-----------------------------------
    0000000 |      9,908       99.08       99.08
    0000009 |          5        0.05       99.13
    026131D |          1        0.01       99.14
    026581A |          1        0.01       99.15
    026765A |          1        0.01       99.16
    027658N |          1        0.01       99.17
    028124A |          1        0.01       99.18
    028208V |          1        0.01       99.19
    028811F |          1        0.01       99.20
    057187H |          2        0.02       99.22
    144880G |          1        0.01       99.23
    205394N |          1        0.01       99.24
    253279J |          1        0.01       99.25
    254221E |          1        0.01       99.26
    330569D |          1        0.01       99.27
    351389N |          1        0.01       99.28
    351467T |          1        0.01       99.29
    425070R |          1        0.01       99.30
    425321H |          1        0.01       99.31
    425755V |          1        0.01       99.32
    431269U |          1        0.01       99.33
    438575K |          1        0.01       99.34
    500638E |          1        0.01       99.35
    531610Y |          2        0.02       99.37
    620059B |          1        0.01       99.38
    620641T |          1        0.01       99.39
    6229519 |          1        0.01       99.40
    624338K |          1        0.01       99.41
    625078X |          1        0.01       99.42
    627059A |          1        0.01       99.43
    628169N |          1        0.01       99.44
    628181V |          1        0.01       99.45
    638078K |          1        0.01       99.46
    638257B |          1        0.01       99.47
    638281C |          1        0.01       99.48
    638449T |          1        0.01       99.49
    640109G |          1        0.01       99.50
    664064V |          1        0.01       99.51
    665982M |          1        0.01       99.52
    723182L |          1        0.01       99.53
    723272K |          1        0.01       99.54
    723346A |          1        0.01       99.55
    726605U |          1        0.01       99.56
    726624Y |          1        0.01       99.57
    726756J |          1        0.01       99.58
    727024A |          1        0.01       99.59
    727085R |          1        0.01       99.60
    731818P |          1        0.01       99.61
    731957K |          1        0.01       99.62
    741363N |          1        0.01       99.63
    745870K |          1        0.01       99.64
    745889C |          1        0.01       99.65
    746895J |          1        0.01       99.66
    746932J |          1        0.01       99.67
    747894F |          1        0.01       99.68
    749772H |          1        0.01       99.69
    750649F |          1        0.01       99.70
    750717E |          1        0.01       99.71
    750734V |          1        0.01       99.72
    752866M |          1        0.01       99.73
    752887F |          1        0.01       99.74
    755205E |          1        0.01       99.75
    756844B |          1        0.01       99.76
    760757E |          1        0.01       99.77
    761240G |          1        0.01       99.78
    766417N |          1        0.01       99.79
    789055U |          1        0.01       99.80
    790813R |          1        0.01       99.81
    804476W |          1        0.01       99.82
    804596M |          1        0.01       99.83
    810993Y |          1        0.01       99.84
    831160H |          2        0.02       99.86
    831299R |          1        0.01       99.87
    834002T |          1        0.01       99.88
    834512W |          1        0.01       99.89
    853353K |          1        0.01       99.90
    865201F |          1        0.01       99.91
    9999999 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016