Frequencies for pmonth variable in parkwork dataset :

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         78        7.15        7.15
          2 |         82        7.52       14.67
          3 |         89        8.16       22.82
          4 |         95        8.71       31.53
          5 |         93        8.52       40.05
          6 |         80        7.33       47.39
          7 |         81        7.42       54.81
          8 |        101        9.26       64.07
          9 |         77        7.06       71.13
         10 |         85        7.79       78.92
         11 |        116       10.63       89.55
         12 |        114       10.45      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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