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

 crash time |
   (minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        502        5.02        5.02
          1 |        111        1.11        6.13
          2 |         84        0.84        6.97
          3 |        119        1.19        8.16
          4 |         87        0.87        9.03
          5 |        346        3.46       12.49
          6 |        107        1.07       13.56
          7 |        114        1.14       14.70
          8 |        131        1.31       16.01
          9 |        120        1.20       17.21
         10 |        392        3.92       21.13
         11 |         82        0.82       21.95
         12 |        141        1.41       23.36
         13 |        130        1.30       24.66
         14 |        125        1.25       25.91
         15 |        356        3.56       29.47
         16 |         88        0.88       30.35
         17 |        115        1.15       31.50
         18 |        142        1.42       32.92
         19 |        100        1.00       33.92
         20 |        368        3.68       37.60
         21 |        100        1.00       38.60
         22 |         92        0.92       39.52
         23 |        111        1.11       40.63
         24 |         74        0.74       41.37
         25 |        340        3.40       44.77
         26 |        120        1.20       45.97
         27 |        107        1.07       47.04
         28 |        147        1.47       48.51
         29 |        119        1.19       49.70
         30 |        492        4.92       54.62
         31 |         81        0.81       55.43
         32 |        117        1.17       56.60
         33 |        109        1.09       57.69
         34 |         91        0.91       58.60
         35 |        319        3.19       61.79
         36 |         96        0.96       62.75
         37 |        111        1.11       63.86
         38 |        138        1.38       65.24
         39 |         87        0.87       66.11
         40 |        356        3.56       69.67
         41 |         87        0.87       70.54
         42 |        106        1.06       71.60
         43 |        113        1.13       72.73
         44 |        132        1.32       74.05
         45 |        445        4.45       78.50
         46 |        109        1.09       79.59
         47 |        138        1.38       80.97
         48 |        132        1.32       82.29
         49 |         87        0.87       83.16
         50 |        376        3.76       86.92
         51 |         98        0.98       87.90
         52 |        116        1.16       89.06
         53 |        118        1.18       90.24
         54 |         88        0.88       91.12
         55 |        307        3.07       94.19
         56 |        121        1.21       95.40
         57 |        126        1.26       96.66
         58 |        127        1.27       97.93
         59 |        119        1.19       99.12
         99 |         88        0.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016