Frequencies for first 10,000 rows of oegest_r10 variable in natl2017 dataset :

  Obstetric |
   Estimate |
Recode10 01 |
   Under 20 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |         47        0.47        0.50
          3 |         70        0.70        1.20
          4 |        116        1.16        2.36
          5 |        648        6.48        8.84
          6 |      2,598       25.98       34.82
          7 |      3,135       31.35       66.17
          8 |      2,298       22.98       89.15
          9 |        998        9.98       99.13
         10 |         82        0.82       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018