Frequencies for first 10,000 rows of dob_mm variable in natl2006 dataset :

Birth Month |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        813        8.13        8.13
          2 |        829        8.29       16.42
          3 |        893        8.93       25.35
          4 |        901        9.01       34.36
          5 |        959        9.59       43.95
          6 |        899        8.99       52.94
          7 |        944        9.44       62.38
          8 |      1,037       10.37       72.75
          9 |        976        9.76       82.51
         10 |        872        8.72       91.23
         11 |        804        8.04       99.27
         12 |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015