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

   Accident |
 Date-Month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,335       13.35       13.35
          2 |      1,251       12.51       25.86
          3 |      1,377       13.77       39.63
          4 |      1,157       11.57       51.20
          5 |        635        6.35       57.55
          6 |        684        6.84       64.39
          7 |        596        5.96       70.35
          8 |        728        7.28       77.63
          9 |        640        6.40       84.03
         10 |        513        5.13       89.16
         11 |        512        5.12       94.28
         12 |        572        5.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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