Frequencies for pminute variable in parkwork dataset :

 Crash Time |
   (Minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         44        4.14        4.14
          1 |         11        1.03        5.17
          2 |         15        1.41        6.58
          3 |         14        1.32        7.89
          4 |          9        0.85        8.74
          5 |         15        1.41       10.15
          6 |         15        1.41       11.56
          7 |         13        1.22       12.78
          8 |         13        1.22       14.00
          9 |         11        1.03       15.04
         10 |         51        4.79       19.83
         11 |         12        1.13       20.96
         12 |         16        1.50       22.46
         13 |         22        2.07       24.53
         14 |         10        0.94       25.47
         15 |         27        2.54       28.01
         16 |         15        1.41       29.42
         17 |         17        1.60       31.02
         18 |         26        2.44       33.46
         19 |         17        1.60       35.06
         20 |         32        3.01       38.06
         21 |          5        0.47       38.53
         22 |         11        1.03       39.57
         23 |         12        1.13       40.70
         24 |          5        0.47       41.17
         25 |         38        3.57       44.74
         26 |         17        1.60       46.33
         27 |         13        1.22       47.56
         28 |         18        1.69       49.25
         29 |          8        0.75       50.00
         30 |         43        4.04       54.04
         31 |         26        2.44       56.48
         32 |         11        1.03       57.52
         33 |         14        1.32       58.83
         34 |          7        0.66       59.49
         35 |         28        2.63       62.12
         36 |         13        1.22       63.35
         37 |          6        0.56       63.91
         38 |         10        0.94       64.85
         39 |         17        1.60       66.45
         40 |         40        3.76       70.21
         41 |         13        1.22       71.43
         42 |         11        1.03       72.46
         43 |         16        1.50       73.97
         44 |         14        1.32       75.28
         45 |         35        3.29       78.57
         46 |         17        1.60       80.17
         47 |         24        2.26       82.42
         48 |          8        0.75       83.18
         49 |         19        1.79       84.96
         50 |         32        3.01       87.97
         51 |         17        1.60       89.57
         52 |         24        2.26       91.82
         53 |         13        1.22       93.05
         54 |         18        1.69       94.74
         55 |         14        1.32       96.05
         56 |          9        0.85       96.90
         57 |         16        1.50       98.40
         58 |         11        1.03       99.44
         59 |          5        0.47       99.91
         99 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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