Frequencies for first 10,000 rows of gestrec10 variable in natlterr2015 dataset :

   Combined |
  Gestation |
  Recode 10 |
01 Under 20 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |         64        0.64        0.66
          3 |        137        1.37        2.03
          4 |        191        1.91        3.94
          5 |        848        8.48       12.42
          6 |      2,559       25.59       38.01
          7 |      2,239       22.39       60.40
          8 |      1,515       15.15       75.55
          9 |        659        6.59       82.14
         10 |        676        6.76       88.90
         99 |      1,110       11.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016