Frequencies for first 10,000 rows of gestat3 variable in natl1983 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,194       11.94       11.94
          2 |      8,605       86.05       97.99
          3 |        201        2.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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