Frequencies for first 10,000 rows of oegest_comb variable in natl2016 dataset :

  Obstetric |
   Estimate |
     Edited |
17-47 Weeks |
         of |
  gestation |      Freq.     Percent        Cum.
------------+-----------------------------------
         17 |          1        0.01        0.01
         18 |          1        0.01        0.02
         19 |          2        0.02        0.04
         21 |          1        0.01        0.05
         22 |          3        0.03        0.08
         23 |          5        0.05        0.13
         24 |         10        0.10        0.23
         25 |          9        0.09        0.32
         26 |          7        0.07        0.39
         27 |         11        0.11        0.50
         28 |         12        0.12        0.62
         29 |         13        0.13        0.75
         30 |         16        0.16        0.91
         31 |         16        0.16        1.07
         32 |         40        0.40        1.47
         33 |         56        0.56        2.03
         34 |        125        1.25        3.28
         35 |        170        1.70        4.98
         36 |        381        3.81        8.79
         37 |        905        9.05       17.84
         38 |      1,667       16.67       34.51
         39 |      3,117       31.17       65.68
         40 |      2,340       23.40       89.08
         41 |      1,021       10.21       99.29
         42 |         64        0.64       99.93
         43 |          2        0.02       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017