Frequencies for pmonth variable in parkwork dataset :

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         98        8.55        8.55
          2 |         67        5.85       14.40
          3 |         95        8.29       22.69
          4 |         88        7.68       30.37
          5 |         93        8.12       38.48
          6 |        107        9.34       47.82
          7 |         93        8.12       55.93
          8 |        125       10.91       66.84
          9 |         91        7.94       74.78
         10 |         91        7.94       82.72
         11 |        106        9.25       91.97
         12 |         92        8.03      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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