Frequencies for first 10,000 rows of gestrec3 variable in natl2016 dataset :

   Combined |
  Gestation |
 Recode 3 1 |
   Under 37 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,038       10.38       10.38
          2 |      8,957       89.57       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017