Frequencies for month variable in person dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         96        8.91        8.91
          2 |         84        7.80       16.71
          3 |         85        7.89       24.61
          4 |         69        6.41       31.01
          5 |         72        6.69       37.70
          6 |        111       10.31       48.00
          7 |        103        9.56       57.57
          8 |         97        9.01       66.57
          9 |         69        6.41       72.98
         10 |        113       10.49       83.47
         11 |         80        7.43       90.90
         12 |         98        9.10      100.00
------------+-----------------------------------
      Total |      1,077      100.00

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