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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,047       10.47       10.47
          2 |      1,014       10.14       20.61
          3 |      1,356       13.56       34.17
          4 |      1,154       11.54       45.71
          5 |      1,298       12.98       58.69
          6 |        550        5.50       64.19
          7 |        789        7.89       72.08
          8 |        545        5.45       77.53
          9 |        507        5.07       82.60
         10 |        584        5.84       88.44
         11 |        570        5.70       94.14
         12 |        586        5.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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