Frequencies for first 10,000 rows of gestrec10 variable in natlterr2007 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |         62        0.62        0.64
          3 |        130        1.30        1.94
          4 |        189        1.89        3.83
          5 |      1,066       10.66       14.49
          6 |      4,849       48.49       62.98
          7 |      1,267       12.67       75.65
          8 |        525        5.25       80.90
          9 |        580        5.80       86.70
         10 |      1,330       13.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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