Frequencies for first 10,000 rows of llbmon variable in natl1981 dataset :

   Month of |
  Last Live |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        579        5.79        5.79
          2 |        440        4.40       10.19
          3 |        425        4.25       14.44
          4 |        352        3.52       17.96
          5 |        428        4.28       22.24
          6 |        435        4.35       26.59
          7 |        442        4.42       31.01
          8 |        527        5.27       36.28
          9 |        508        5.08       41.36
         10 |        448        4.48       45.84
         11 |        430        4.30       50.14
         12 |        480        4.80       54.94
         77 |      4,400       44.00       98.94
         99 |        106        1.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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