Frequencies for first 10,000 rows of gestat3 variable in natl1988 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,181       11.81       11.81
          2 |      8,497       84.97       96.78
          3 |        322        3.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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