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

   Accident |
 Date-Month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,413       14.13       14.13
          2 |      1,413       14.13       28.26
          3 |      1,530       15.30       43.56
          4 |      1,263       12.63       56.19
          5 |        560        5.60       61.79
          6 |        529        5.29       67.08
          7 |        491        4.91       71.99
          8 |        535        5.35       77.34
          9 |        591        5.91       83.25
         10 |        577        5.77       89.02
         11 |        464        4.64       93.66
         12 |        634        6.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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