Frequencies for first 10,000 rows of llbmon variable in natl1976 dataset :

   Month of |
  Last Live |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        582        5.82        5.82
          2 |        450        4.50       10.32
          3 |        457        4.57       14.89
          4 |        383        3.83       18.72
          5 |        398        3.98       22.70
          6 |        380        3.80       26.50
          7 |        410        4.10       30.60
          8 |        484        4.84       35.44
          9 |        462        4.62       40.06
         10 |        445        4.45       44.51
         11 |        477        4.77       49.28
         12 |        534        5.34       54.62
         77 |      4,444       44.44       99.06
         99 |         94        0.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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