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

  RAIL XING |
         ID |      Freq.     Percent        Cum.
------------+-----------------------------------
    0000000 |      9,953       99.53       99.53
    025590V |          1        0.01       99.54
    026136M |          1        0.01       99.55
    026139H |          1        0.01       99.56
    026643V |          1        0.01       99.57
    026742T |          1        0.01       99.58
    028343N |          1        0.01       99.59
    028682T |          1        0.01       99.60
    028781R |          1        0.01       99.61
    272179F |          1        0.01       99.62
    352066W |          1        0.01       99.63
    437947W |          1        0.01       99.64
    438173D |          1        0.01       99.65
    438226A |          1        0.01       99.66
    600639M |          1        0.01       99.67
    620639S |          1        0.01       99.68
    620753S |          1        0.01       99.69
    622318S |          1        0.01       99.70
    623380F |          1        0.01       99.71
    624151P |          1        0.01       99.72
    624327X |          1        0.01       99.73
    624356H |          1        0.01       99.74
    628183J |          1        0.01       99.75
    639400M |          1        0.01       99.76
    639593W |          1        0.01       99.77
    6652335 |          1        0.01       99.78
    725837F |          1        0.01       99.79
    726068W |          1        0.01       99.80
    731703V |          1        0.01       99.81
    741086G |          1        0.01       99.82
    741714K |          1        0.01       99.83
    745869R |          1        0.01       99.84
    746048P |          1        0.01       99.85
    746785Y |          1        0.01       99.86
    749743X |          1        0.01       99.87
    750136G |          1        0.01       99.88
    750603S |          1        0.01       99.89
    750703W |          1        0.01       99.90
    760732J |          1        0.01       99.91
     831200 |          1        0.01       99.92
    833644D |          1        0.01       99.93
    833722H |          1        0.01       99.94
    864483V |          1        0.01       99.95
    9999999 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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