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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,092       10.92       10.92
          2 |        965        9.65       20.57
          3 |      1,103       11.03       31.60
          4 |      1,027       10.27       41.87
          5 |      1,130       11.30       53.17
          6 |        927        9.27       62.44
          7 |        843        8.43       70.87
          8 |        602        6.02       76.89
          9 |        399        3.99       80.88
         10 |        627        6.27       87.15
         11 |        628        6.28       93.43
         12 |        657        6.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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