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

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        876        8.76        8.76
          2 |        874        8.74       17.50
          3 |      1,089       10.89       28.39
          4 |      1,045       10.45       38.84
          5 |        987        9.87       48.71
          6 |        945        9.45       58.16
          7 |      1,051       10.51       68.67
          8 |        892        8.92       77.59
          9 |        675        6.75       84.34
         10 |        644        6.44       90.78
         11 |        492        4.92       95.70
         12 |        430        4.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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