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

   Accident |
 Date-Month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,461       14.61       14.61
          2 |      1,324       13.24       27.85
          3 |      1,463       14.63       42.48
          4 |      1,207       12.07       54.55
          5 |        583        5.83       60.38
          6 |        579        5.79       66.17
          7 |        590        5.90       72.07
          8 |        589        5.89       77.96
          9 |        565        5.65       83.61
         10 |        557        5.57       89.18
         11 |        471        4.71       93.89
         12 |        611        6.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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