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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,219       12.19       12.19
          2 |        970        9.70       21.89
          3 |      1,403       14.03       35.92
          4 |      1,090       10.90       46.82
          5 |        832        8.32       55.14
          6 |        780        7.80       62.94
          7 |        795        7.95       70.89
          8 |        569        5.69       76.58
          9 |        578        5.78       82.36
         10 |        658        6.58       88.94
         11 |        524        5.24       94.18
         12 |        582        5.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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