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

     minute |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        915        9.15        9.15
          1 |         70        0.70        9.85
          2 |         75        0.75       10.60
          3 |         58        0.58       11.18
          4 |         63        0.63       11.81
          5 |        454        4.54       16.35
          6 |         48        0.48       16.83
          7 |         63        0.63       17.46
          8 |         69        0.69       18.15
          9 |         46        0.46       18.61
         10 |        536        5.36       23.97
         11 |         58        0.58       24.55
         12 |         74        0.74       25.29
         13 |         71        0.71       26.00
         14 |         50        0.50       26.50
         15 |        690        6.90       33.40
         16 |         39        0.39       33.79
         17 |         62        0.62       34.41
         18 |         74        0.74       35.15
         19 |         55        0.55       35.70
         20 |        556        5.56       41.26
         21 |         54        0.54       41.80
         22 |         75        0.75       42.55
         23 |         69        0.69       43.24
         24 |         69        0.69       43.93
         25 |        411        4.11       48.04
         26 |         51        0.51       48.55
         27 |         58        0.58       49.13
         28 |         74        0.74       49.87
         29 |         63        0.63       50.50
         30 |        870        8.70       59.20
         31 |         48        0.48       59.68
         32 |         55        0.55       60.23
         33 |         61        0.61       60.84
         34 |         48        0.48       61.32
         35 |        436        4.36       65.68
         36 |         53        0.53       66.21
         37 |         50        0.50       66.71
         38 |         71        0.71       67.42
         39 |         60        0.60       68.02
         40 |        520        5.20       73.22
         41 |         49        0.49       73.71
         42 |         50        0.50       74.21
         43 |         69        0.69       74.90
         44 |         58        0.58       75.48
         45 |        645        6.45       81.93
         46 |         59        0.59       82.52
         47 |         58        0.58       83.10
         48 |         90        0.90       84.00
         49 |         41        0.41       84.41
         50 |        564        5.64       90.05
         51 |         49        0.49       90.54
         52 |         50        0.50       91.04
         53 |         58        0.58       91.62
         54 |         53        0.53       92.15
         55 |        425        4.25       96.40
         56 |         57        0.57       96.97
         57 |         62        0.62       97.59
         58 |         84        0.84       98.43
         59 |         63        0.63       99.06
         99 |         94        0.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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