Frequencies for pmonth variable in parkwork dataset :

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         60        5.54        5.54
          2 |         58        5.35       10.89
          3 |         67        6.18       17.07
          4 |         87        8.03       25.09
          5 |        110       10.15       35.24
          6 |        104        9.59       44.83
          7 |        103        9.50       54.34
          8 |         97        8.95       63.28
          9 |         84        7.75       71.03
         10 |         95        8.76       79.80
         11 |         95        8.76       88.56
         12 |        124       11.44      100.00
------------+-----------------------------------
      Total |      1,084      100.00

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