Frequencies for pminute variable in parkwork dataset :

 crash time |
   (minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         48        4.43        4.43
          1 |         25        2.31        6.73
          2 |          8        0.74        7.47
          3 |         15        1.38        8.86
          4 |         13        1.20       10.06
          5 |         22        2.03       12.08
          6 |          8        0.74       12.82
          7 |         15        1.38       14.21
          8 |         14        1.29       15.50
          9 |         12        1.11       16.61
         10 |         38        3.51       20.11
         11 |         13        1.20       21.31
         12 |          8        0.74       22.05
         13 |         17        1.57       23.62
         14 |         16        1.48       25.09
         15 |         39        3.60       28.69
         16 |         18        1.66       30.35
         17 |         11        1.01       31.37
         18 |         14        1.29       32.66
         19 |         11        1.01       33.67
         20 |         43        3.97       37.64
         21 |         16        1.48       39.11
         22 |         14        1.29       40.41
         23 |         11        1.01       41.42
         24 |         22        2.03       43.45
         25 |         34        3.14       46.59
         26 |         13        1.20       47.79
         27 |         13        1.20       48.99
         28 |         15        1.38       50.37
         29 |         10        0.92       51.29
         30 |         44        4.06       55.35
         31 |         10        0.92       56.27
         32 |         13        1.20       57.47
         33 |         12        1.11       58.58
         34 |         21        1.94       60.52
         35 |         24        2.21       62.73
         36 |         16        1.48       64.21
         37 |          7        0.65       64.85
         38 |         13        1.20       66.05
         39 |         15        1.38       67.44
         40 |         32        2.95       70.39
         41 |         12        1.11       71.49
         42 |          8        0.74       72.23
         43 |         18        1.66       73.89
         44 |         22        2.03       75.92
         45 |         28        2.58       78.51
         46 |         10        0.92       79.43
         47 |         16        1.48       80.90
         48 |         18        1.66       82.56
         49 |          5        0.46       83.03
         50 |         46        4.24       87.27
         51 |         12        1.11       88.38
         52 |          8        0.74       89.11
         53 |         19        1.75       90.87
         54 |         10        0.92       91.79
         55 |         35        3.23       95.02
         56 |         12        1.11       96.13
         57 |         16        1.48       97.60
         58 |         10        0.92       98.52
         59 |         14        1.29       99.82
         99 |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,084      100.00

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