Frequencies for first 10,000 rows of oegest_r3 variable in natlterr2015 dataset :

  Obstetric |
   Estimate |
 Recode 3 1 |
   Under 37 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        883        8.83        8.83
          2 |      8,007       80.07       88.90
          3 |      1,110       11.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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