Frequencies for pminute variable in parkwork dataset :

 crash time |
   (minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         44        4.04        4.04
          1 |         25        2.30        6.34
          2 |          8        0.73        7.07
          3 |         15        1.38        8.45
          4 |         13        1.19        9.64
          5 |         22        2.02       11.66
          6 |          8        0.73       12.40
          7 |         15        1.38       13.77
          8 |         14        1.29       15.06
          9 |         12        1.10       16.16
         10 |         38        3.49       19.65
         11 |         15        1.38       21.03
         12 |          9        0.83       21.85
         13 |         17        1.56       23.42
         14 |         16        1.47       24.89
         15 |         41        3.76       28.65
         16 |         18        1.65       30.30
         17 |         11        1.01       31.31
         18 |         14        1.29       32.60
         19 |         11        1.01       33.61
         20 |         43        3.95       37.56
         21 |         16        1.47       39.03
         22 |         14        1.29       40.31
         23 |         11        1.01       41.32
         24 |         22        2.02       43.34
         25 |         34        3.12       46.46
         26 |         13        1.19       47.66
         27 |         15        1.38       49.04
         28 |         15        1.38       50.41
         29 |         10        0.92       51.33
         30 |         45        4.13       55.46
         31 |         11        1.01       56.47
         32 |         13        1.19       57.67
         33 |         12        1.10       58.77
         34 |         22        2.02       60.79
         35 |         24        2.20       62.99
         36 |         15        1.38       64.37
         37 |          7        0.64       65.01
         38 |         13        1.19       66.21
         39 |         15        1.38       67.58
         40 |         32        2.94       70.52
         41 |         12        1.10       71.63
         42 |          8        0.73       72.36
         43 |         18        1.65       74.01
         44 |         22        2.02       76.03
         45 |         28        2.57       78.60
         46 |         10        0.92       79.52
         47 |         16        1.47       80.99
         48 |         18        1.65       82.64
         49 |          5        0.46       83.10
         50 |         46        4.22       87.33
         51 |         12        1.10       88.43
         52 |          8        0.73       89.16
         53 |         19        1.74       90.91
         54 |         10        0.92       91.83
         55 |         35        3.21       95.04
         56 |         12        1.10       96.14
         57 |         16        1.47       97.61
         58 |         10        0.92       98.53
         59 |         14        1.29       99.82
         99 |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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