Frequencies for first 10,000 rows of gestrec3 variable in natlterr2007 dataset :

  Gestation |
   Recode 3 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,449       14.49       14.49
          2 |      7,221       72.21       86.70
          3 |      1,330       13.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015