Frequencies for first 10,000 rows of oegest_comb variable in natl2014 dataset :

  Obstetric |
   Estimate |
     Edited |
17-47 Weeks |
         of |
  gestation |      Freq.     Percent        Cum.
------------+-----------------------------------
         21 |          4        0.04        0.04
         22 |          4        0.04        0.08
         23 |          3        0.03        0.11
         24 |          9        0.09        0.20
         25 |          8        0.08        0.28
         26 |          9        0.09        0.37
         27 |          5        0.05        0.42
         28 |          8        0.08        0.50
         29 |          9        0.09        0.59
         30 |         20        0.20        0.79
         31 |         20        0.20        0.99
         32 |         37        0.37        1.36
         33 |         53        0.53        1.89
         34 |        114        1.14        3.03
         35 |        176        1.76        4.79
         36 |        352        3.52        8.31
         37 |        948        9.48       17.79
         38 |      1,573       15.73       33.52
         39 |      3,040       30.40       63.92
         40 |      2,509       25.09       89.01
         41 |        987        9.87       98.88
         42 |         85        0.85       99.73
         43 |          2        0.02       99.75
         44 |          3        0.03       99.78
         47 |          1        0.01       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016