Frequencies for first 10,000 rows of llbmon variable in natl1977 dataset :

   Month of |
  Last Live |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        531        5.31        5.31
          2 |        507        5.07       10.38
          3 |        483        4.83       15.21
          4 |        359        3.59       18.80
          5 |        406        4.06       22.86
          6 |        385        3.85       26.71
          7 |        442        4.42       31.13
          8 |        518        5.18       36.31
          9 |        493        4.93       41.24
         10 |        520        5.20       46.44
         11 |        502        5.02       51.46
         12 |        491        4.91       56.37
         77 |      4,312       43.12       99.49
         99 |         51        0.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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