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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,226       12.26       12.26
          2 |      1,165       11.65       23.91
          3 |      1,378       13.78       37.69
          4 |      1,275       12.75       50.44
          5 |        865        8.65       59.09
          6 |        661        6.61       65.70
          7 |        717        7.17       72.87
          8 |        490        4.90       77.77
          9 |        531        5.31       83.08
         10 |        569        5.69       88.77
         11 |        608        6.08       94.85
         12 |        515        5.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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