Frequencies for first 10,000 rows of gestat10 variable in natlterr2002 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         62        0.62        0.62
          3 |        110        1.10        1.72
          4 |        729        7.29        9.01
          5 |        760        7.60       16.61
          6 |      6,482       64.82       81.43
          7 |      1,376       13.76       95.19
          8 |        326        3.26       98.45
          9 |        152        1.52       99.97
         10 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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