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

  RAIL XING |
         ID |      Freq.     Percent        Cum.
------------+-----------------------------------
    0000000 |      9,947       99.47       99.47
    003410J |          1        0.01       99.48
    026852D |          1        0.01       99.49
    027235N |          1        0.01       99.50
    028455M |          1        0.01       99.51
    028689R |          1        0.01       99.52
    057325U |          1        0.01       99.53
    063952D |          1        0.01       99.54
    272070P |          1        0.01       99.55
    272074S |          1        0.01       99.56
    272502L |          1        0.01       99.57
    272578S |          1        0.01       99.58
    351270S |          1        0.01       99.59
    351319Y |          1        0.01       99.60
    351366G |          1        0.01       99.61
    351460V |          1        0.01       99.62
    351839N |          1        0.01       99.63
    426309E |          1        0.01       99.64
    438643J |          1        0.01       99.65
    471341N |          1        0.01       99.66
    516095N |          1        0.01       99.67
    597479U |          1        0.01       99.68
    600600T |          1        0.01       99.69
    600639M |          1        0.01       99.70
    600640G |          1        0.01       99.71
    620733F |          1        0.01       99.72
    620959S |          1        0.01       99.73
    621274R |          1        0.01       99.74
    622067A |          1        0.01       99.75
    624535Y |          1        0.01       99.76
    624915F |          1        0.01       99.77
    627621F |          1        0.01       99.78
    667516N |          1        0.01       99.79
    667983B |          1        0.01       99.80
    723173M |          1        0.01       99.81
    723175B |          1        0.01       99.82
    725835S |          1        0.01       99.83
    727011Y |          1        0.01       99.84
    727654U |          1        0.01       99.85
    727712M |          1        0.01       99.86
    731958S |          2        0.02       99.88
    742126F |          1        0.01       99.89
    745848X |          1        0.01       99.90
    747282T |          1        0.01       99.91
    747311S |          1        0.01       99.92
    748173J |          1        0.01       99.93
    752064M |          1        0.01       99.94
    834216K |          1        0.01       99.95
    868403N |          1        0.01       99.96
    9999999 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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