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

   Accident |
 Date-Month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,312       13.12       13.12
          2 |      1,304       13.04       26.16
          3 |      1,333       13.33       39.49
          4 |      1,318       13.18       52.67
          5 |        926        9.26       61.93
          6 |        588        5.88       67.81
          7 |        554        5.54       73.35
          8 |        586        5.86       79.21
          9 |        553        5.53       84.74
         10 |        505        5.05       89.79
         11 |        560        5.60       95.39
         12 |        461        4.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016