Frequencies for first 10,000 rows of oegest_r10 variable in natl2015 dataset :

  Obstetric |
   Estimate |
Recode10 01 |
   Under 20 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.04        0.04
          2 |         49        0.49        0.53
          3 |         59        0.59        1.12
          4 |         95        0.95        2.07
          5 |        681        6.81        8.88
          6 |      2,480       24.80       33.68
          7 |      3,147       31.47       65.15
          8 |      2,457       24.57       89.72
          9 |        917        9.17       98.89
         10 |        101        1.01       99.90
         99 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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