Frequencies for first 10,000 rows of month variable in person dataset :

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        991        9.91        9.91
          2 |        828        8.28       18.19
          3 |        925        9.25       27.44
          4 |        995        9.95       37.39
          5 |        863        8.63       46.02
          6 |        892        8.92       54.94
          7 |        946        9.46       64.40
          8 |        770        7.70       72.10
          9 |        632        6.32       78.42
         10 |        703        7.03       85.45
         11 |        937        9.37       94.82
         12 |        518        5.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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