Frequencies for first 10,000 rows of gestrec10 variable in natl2015 dataset :

   Combined |
  Gestation |
  Recode 10 |
01 Under 20 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |         50        0.50        0.55
          3 |         87        0.87        1.42
          4 |        123        1.23        2.65
          5 |        757        7.57       10.22
          6 |      2,398       23.98       34.20
          7 |      2,648       26.48       60.68
          8 |      2,114       21.14       81.82
          9 |      1,111       11.11       92.93
         10 |        697        6.97       99.90
         99 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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