Frequencies for pminute variable in parkwork dataset :

 Crash Time |
   (Minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         51        5.09        5.09
          1 |         14        1.40        6.49
          2 |         12        1.20        7.68
          3 |         22        2.20        9.88
          4 |         13        1.30       11.18
          5 |         30        2.99       14.17
          6 |          5        0.50       14.67
          7 |         25        2.50       17.17
          8 |         14        1.40       18.56
          9 |         10        1.00       19.56
         10 |         32        3.19       22.75
         11 |          7        0.70       23.45
         12 |         13        1.30       24.75
         13 |         10        1.00       25.75
         14 |         23        2.30       28.04
         15 |         34        3.39       31.44
         16 |         13        1.30       32.73
         17 |         14        1.40       34.13
         18 |         14        1.40       35.53
         19 |          8        0.80       36.33
         20 |         26        2.59       38.92
         21 |         11        1.10       40.02
         22 |         13        1.30       41.32
         23 |         27        2.69       44.01
         24 |         15        1.50       45.51
         25 |         35        3.49       49.00
         26 |          8        0.80       49.80
         27 |         16        1.60       51.40
         28 |         10        1.00       52.40
         29 |         15        1.50       53.89
         30 |         39        3.89       57.78
         31 |          4        0.40       58.18
         32 |          8        0.80       58.98
         33 |         15        1.50       60.48
         34 |         21        2.10       62.57
         35 |         24        2.40       64.97
         36 |         18        1.80       66.77
         37 |          7        0.70       67.47
         38 |         16        1.60       69.06
         39 |         12        1.20       70.26
         40 |         27        2.69       72.95
         41 |         11        1.10       74.05
         42 |          7        0.70       74.75
         43 |          7        0.70       75.45
         44 |         15        1.50       76.95
         45 |         29        2.89       79.84
         46 |         12        1.20       81.04
         47 |          5        0.50       81.54
         48 |          9        0.90       82.44
         49 |         11        1.10       83.53
         50 |         45        4.49       88.02
         51 |         10        1.00       89.02
         52 |         11        1.10       90.12
         53 |          9        0.90       91.02
         54 |          8        0.80       91.82
         55 |         27        2.69       94.51
         56 |         14        1.40       95.91
         57 |         17        1.70       97.60
         58 |          7        0.70       98.30
         59 |         14        1.40       99.70
         99 |          3        0.30      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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