Frequencies for first 10,000 rows of gestat3 variable in natl1976 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        854        8.54        8.54
          2 |      7,441       74.41       82.95
          3 |      1,705       17.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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