Frequencies for first 10,000 rows of gestrec3 variable in natlterr2014 dataset 

   Combined |
  Gestation |
 Recode 3 1 |
   Under 37 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,263       12.63       12.63
          2 |      7,634       76.34       88.97
          3 |      1,103       11.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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