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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,083       10.83       10.83
          2 |      1,081       10.81       21.64
          3 |      1,121       11.21       32.85
          4 |      1,269       12.69       45.54
          5 |      1,165       11.65       57.19
          6 |      1,139       11.39       68.58
          7 |        836        8.36       76.94
          8 |        493        4.93       81.87
          9 |        471        4.71       86.58
         10 |        527        5.27       91.85
         11 |        405        4.05       95.90
         12 |        410        4.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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