Frequencies for pmonth variable in parkwork dataset :

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         97        8.56        8.56
          2 |         65        5.74       14.30
          3 |         90        7.94       22.24
          4 |         88        7.77       30.01
          5 |         94        8.30       38.31
          6 |        122       10.77       49.07
          7 |        102        9.00       58.08
          8 |         89        7.86       65.93
          9 |        105        9.27       75.20
         10 |        104        9.18       84.38
         11 |         95        8.38       92.76
         12 |         82        7.24      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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