Frequencies for first 10,000 rows of gestat10 variable in natlterr1996 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         45        0.45        0.45
          3 |         94        0.94        1.39
          4 |        542        5.42        6.81
          5 |        477        4.77       11.58
          6 |      5,201       52.01       63.59
          7 |      2,326       23.26       86.85
          8 |        944        9.44       96.29
          9 |        367        3.67       99.96
         10 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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