Frequencies for pmonth variable in parkwork dataset :

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         61        5.60        5.60
          2 |         58        5.33       10.93
          3 |         69        6.34       17.26
          4 |         87        7.99       25.25
          5 |        110       10.10       35.35
          6 |        104        9.55       44.90
          7 |        104        9.55       54.45
          8 |         97        8.91       63.36
          9 |         84        7.71       71.07
         10 |         95        8.72       79.80
         11 |         95        8.72       88.52
         12 |        125       11.48      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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