Frequencies for first 10,000 rows of oegest_comb variable in natlterr2015 dataset :

  Obstetric |
   Estimate |
     Edited |
17-47 Weeks |
         of |
  gestation |      Freq.     Percent        Cum.
------------+-----------------------------------
         19 |          1        0.01        0.01
         20 |          2        0.02        0.03
         21 |          1        0.01        0.04
         22 |          4        0.04        0.08
         23 |          2        0.02        0.10
         24 |         12        0.12        0.22
         25 |          7        0.07        0.29
         26 |          8        0.08        0.37
         27 |         12        0.12        0.49
         28 |         18        0.18        0.67
         29 |         24        0.24        0.91
         30 |         16        0.16        1.07
         31 |         29        0.29        1.36
         32 |         43        0.43        1.79
         33 |         56        0.56        2.35
         34 |        106        1.06        3.41
         35 |        175        1.75        5.16
         36 |        367        3.67        8.83
         37 |        935        9.35       18.18
         38 |      2,070       20.70       38.88
         39 |      2,814       28.14       67.02
         40 |      1,708       17.08       84.10
         41 |        432        4.32       88.42
         42 |         41        0.41       88.83
         43 |          5        0.05       88.88
         44 |          2        0.02       88.90
         99 |      1,110       11.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016