Frequencies for first 10,000 rows of oegest_comb variable in natl2017 dataset :

  Obstetric |
   Estimate |
     Edited |
17-47 Weeks |
         of |
  gestation |      Freq.     Percent        Cum.
------------+-----------------------------------
         19 |          3        0.03        0.03
         20 |          3        0.03        0.06
         21 |          1        0.01        0.07
         22 |          3        0.03        0.10
         23 |          3        0.03        0.13
         24 |          4        0.04        0.17
         25 |         11        0.11        0.28
         26 |         13        0.13        0.41
         27 |          9        0.09        0.50
         28 |         14        0.14        0.64
         29 |         14        0.14        0.78
         30 |         23        0.23        1.01
         31 |         19        0.19        1.20
         32 |         52        0.52        1.72
         33 |         64        0.64        2.36
         34 |        105        1.05        3.41
         35 |        188        1.88        5.29
         36 |        355        3.55        8.84
         37 |        952        9.52       18.36
         38 |      1,646       16.46       34.82
         39 |      3,135       31.35       66.17
         40 |      2,298       22.98       89.15
         41 |        998        9.98       99.13
         42 |         80        0.80       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 , 19 Sep 2018