Frequencies for first 10,000 rows of minute variable in vehicle dataset :

 Crash Time |
   (Minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        568        5.68        5.68
          1 |        101        1.01        6.69
          2 |        119        1.19        7.88
          3 |        115        1.15        9.03
          4 |        138        1.38       10.41
          5 |        293        2.93       13.34
          6 |         99        0.99       14.33
          7 |        112        1.12       15.45
          8 |        114        1.14       16.59
          9 |        103        1.03       17.62
         10 |        413        4.13       21.75
         11 |         97        0.97       22.72
         12 |        109        1.09       23.81
         13 |         84        0.84       24.65
         14 |        116        1.16       25.81
         15 |        416        4.16       29.97
         16 |         98        0.98       30.95
         17 |        122        1.22       32.17
         18 |        131        1.31       33.48
         19 |        105        1.05       34.53
         20 |        431        4.31       38.84
         21 |         94        0.94       39.78
         22 |        126        1.26       41.04
         23 |        108        1.08       42.12
         24 |         87        0.87       42.99
         25 |        373        3.73       46.72
         26 |         93        0.93       47.65
         27 |        106        1.06       48.71
         28 |        128        1.28       49.99
         29 |         93        0.93       50.92
         30 |        497        4.97       55.89
         31 |         95        0.95       56.84
         32 |         79        0.79       57.63
         33 |        107        1.07       58.70
         34 |         89        0.89       59.59
         35 |        319        3.19       62.78
         36 |         99        0.99       63.77
         37 |         95        0.95       64.72
         38 |        101        1.01       65.73
         39 |         91        0.91       66.64
         40 |        423        4.23       70.87
         41 |         71        0.71       71.58
         42 |        116        1.16       72.74
         43 |         92        0.92       73.66
         44 |        112        1.12       74.78
         45 |        386        3.86       78.64
         46 |        123        1.23       79.87
         47 |         96        0.96       80.83
         48 |        135        1.35       82.18
         49 |        111        1.11       83.29
         50 |        444        4.44       87.73
         51 |         88        0.88       88.61
         52 |        109        1.09       89.70
         53 |        142        1.42       91.12
         54 |         95        0.95       92.07
         55 |        287        2.87       94.94
         56 |         92        0.92       95.86
         57 |        102        1.02       96.88
         58 |        114        1.14       98.02
         59 |        103        1.03       99.05
         99 |         95        0.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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