Frequencies for first 10,000 rows of gestrec10 variable in natlterr2008 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |         47        0.47        0.48
          3 |        125        1.25        1.73
          4 |        192        1.92        3.65
          5 |      1,088       10.88       14.53
          6 |      4,816       48.16       62.69
          7 |      1,251       12.51       75.20
          8 |        567        5.67       80.87
          9 |        567        5.67       86.54
         10 |      1,346       13.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016