Frequencies for first 10,000 rows of gestat3 variable in natl1990 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,287       12.87       12.87
          2 |      8,694       86.94       99.81
          3 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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