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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,053       10.53       10.53
          2 |      1,114       11.14       21.67
          3 |      1,280       12.80       34.47
          4 |      1,011       10.11       44.58
          5 |      1,171       11.71       56.29
          6 |        634        6.34       62.63
          7 |        628        6.28       68.91
          8 |        747        7.47       76.38
          9 |        601        6.01       82.39
         10 |        554        5.54       87.93
         11 |        600        6.00       93.93
         12 |        607        6.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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