Frequencies for first 10,000 rows of dob_mm variable in natl2008 dataset :

Birth Month |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,463       54.63       54.63
          2 |      4,537       45.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016