Frequencies for first 10,000 rows of gestat3 variable in natl1985 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,176       11.76       11.76
          2 |      8,580       85.80       97.56
          3 |        244        2.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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