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

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        994        9.94        9.94
          2 |        825        8.25       18.19
          3 |        926        9.26       27.45
          4 |        998        9.98       37.43
          5 |        870        8.70       46.13
          6 |        892        8.92       55.05
          7 |        946        9.46       64.51
          8 |        764        7.64       72.15
          9 |        633        6.33       78.48
         10 |        704        7.04       85.52
         11 |        930        9.30       94.82
         12 |        518        5.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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