Frequencies for first 10,000 rows of gestrec10 variable in natlterr2005 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.04        0.04
          2 |         66        0.66        0.70
          3 |        133        1.33        2.03
          4 |        706        7.06        9.09
          5 |        456        4.56       13.65
          6 |      4,519       45.19       58.84
          7 |      1,247       12.47       71.31
          8 |        598        5.98       77.29
          9 |        545        5.45       82.74
         10 |      1,726       17.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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