Frequencies for first 10,000 rows of dob_mm variable in natl2011 dataset :

Birth Month |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        956        9.56        9.56
          2 |        875        8.75       18.31
          3 |        977        9.77       28.08
          4 |        943        9.43       37.51
          5 |        983        9.83       47.34
          6 |      1,023       10.23       57.57
          7 |        931        9.31       66.88
          8 |        916        9.16       76.04
          9 |        998        9.98       86.02
         10 |        883        8.83       94.85
         11 |        515        5.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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