Frequencies for first 10,000 rows of gestat10 variable in natlterr1997 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         56        0.56        0.56
          3 |        114        1.14        1.70
          4 |        514        5.14        6.84
          5 |        458        4.58       11.42
          6 |      5,413       54.13       65.55
          7 |      2,289       22.89       88.44
          8 |        816        8.16       96.60
          9 |        337        3.37       99.97
         10 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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