Frequencies for first 10,000 rows of gestat3 variable in natl1980 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        852        8.52        8.52
          2 |      7,226       72.26       80.78
          3 |      1,922       19.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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