Frequencies for first 10,000 rows of gestrec10 variable in natl2014 dataset :

   Combined |
  Gestation |
  Recode 10 |
01 Under 20 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         46        0.46        0.46
          3 |         82        0.82        1.28
          4 |        119        1.19        2.47
          5 |        740        7.40        9.87
          6 |      2,461       24.61       34.48
          7 |      2,536       25.36       59.84
          8 |      2,138       21.38       81.22
          9 |      1,194       11.94       93.16
         10 |        663        6.63       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016