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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,246       12.46       12.46
          2 |      1,177       11.77       24.23
          3 |      1,229       12.29       36.52
          4 |      1,379       13.79       50.31
          5 |      1,290       12.90       63.21
          6 |        525        5.25       68.46
          7 |        549        5.49       73.95
          8 |        514        5.14       79.09
          9 |        554        5.54       84.63
         10 |        543        5.43       90.06
         11 |        496        4.96       95.02
         12 |        498        4.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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