Frequencies for first 10,000 rows of gestat10 variable in natlterr1999 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         62        0.62        0.62
          3 |        120        1.20        1.82
          4 |        646        6.46        8.28
          5 |        570        5.70       13.98
          6 |      5,786       57.86       71.84
          7 |      1,909       19.09       90.93
          8 |        623        6.23       97.16
          9 |        277        2.77       99.93
         10 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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