Frequencies for first 10,000 rows of gestat3 variable in natl1998 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,470       14.70       14.70
          2 |      8,526       85.26       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015