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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,239       12.39       12.39
          2 |        989        9.89       22.28
          3 |      1,371       13.71       35.99
          4 |      1,290       12.90       48.89
          5 |        548        5.48       54.37
          6 |        649        6.49       60.86
          7 |        602        6.02       66.88
          8 |        687        6.87       73.75
          9 |        677        6.77       80.52
         10 |        712        7.12       87.64
         11 |        671        6.71       94.35
         12 |        565        5.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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