Frequencies for first 10,000 rows of dob_mm variable in natlterr2013 dataset :

Birth Month |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,582       35.82       35.82
          2 |      1,890       18.90       54.72
          3 |        421        4.21       58.93
          4 |        452        4.52       63.45
          5 |        453        4.53       67.98
          6 |        424        4.24       72.22
          7 |        433        4.33       76.55
          8 |        470        4.70       81.25
          9 |        451        4.51       85.76
         10 |        495        4.95       90.71
         11 |        499        4.99       95.70
         12 |        430        4.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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