Frequencies for first 10,000 rows of gestat3 variable in natl1981 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,104       11.04       11.04
          2 |      8,681       86.81       97.85
          3 |        215        2.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016