Frequencies for first 10,000 rows of gestat3 variable in natl1987 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,247       12.47       12.47
          2 |      8,458       84.58       97.05
          3 |        295        2.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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