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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,246       12.46       12.46
          2 |      1,194       11.94       24.40
          3 |      1,412       14.12       38.52
          4 |      1,407       14.07       52.59
          5 |        710        7.10       59.69
          6 |        578        5.78       65.47
          7 |        581        5.81       71.28
          8 |        604        6.04       77.32
          9 |        477        4.77       82.09
         10 |        561        5.61       87.70
         11 |        606        6.06       93.76
         12 |        624        6.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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