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

    Date of |
 Last Fetal |
    Death - |
       Year |      Freq.     Percent        Cum.
------------+-----------------------------------
         52 |          2        0.02        0.02
         57 |          4        0.04        0.06
         58 |          2        0.02        0.08
         59 |          4        0.04        0.12
         60 |          3        0.03        0.15
         61 |          7        0.07        0.22
         62 |          6        0.06        0.28
         63 |         11        0.11        0.39
         64 |         17        0.17        0.56
         65 |         20        0.20        0.76
         66 |         22        0.22        0.98
         67 |         25        0.25        1.23
         68 |         46        0.46        1.69
         69 |         56        0.56        2.25
         70 |         68        0.68        2.93
         71 |        103        1.03        3.96
         72 |        136        1.36        5.32
         73 |        181        1.81        7.13
         74 |        347        3.47       10.60
         75 |        150        1.50       12.10
         76 |          1        0.01       12.11
         77 |      8,686       86.86       98.97
         99 |        103        1.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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