Frequencies for first 10,000 rows of gestat3 variable in natl1979 dataset :

  Gestation |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        871        8.71        8.71
          2 |      7,213       72.13       80.84
          3 |      1,916       19.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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