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

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        877        8.77        8.77
          2 |        764        7.64       16.41
          3 |        993        9.93       26.34
          4 |        994        9.94       36.28
          5 |        924        9.24       45.52
          6 |        960        9.60       55.12
          7 |        885        8.85       63.97
          8 |        920        9.20       73.17
          9 |        822        8.22       81.39
         10 |        955        9.55       90.94
         11 |        517        5.17       96.11
         12 |        389        3.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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