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

    Date of |
 Last Fetal |
    Death - |
      Month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        114        1.14        1.14
          2 |         88        0.88        2.02
          3 |         90        0.90        2.92
          4 |         74        0.74        3.66
          5 |         73        0.73        4.39
          6 |         73        0.73        5.12
          7 |         70        0.70        5.82
          8 |         65        0.65        6.47
          9 |         85        0.85        7.32
         10 |         63        0.63        7.95
         11 |         82        0.82        8.77
         12 |         91        0.91        9.68
         77 |      8,665       86.65       96.33
         99 |        367        3.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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