Frequencies for first 10,000 rows of gestrec10 variable in natl2017 dataset :

   Combined |
  Gestation |
  Recode 10 |
01 Under 20 |
      weeks |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |         46        0.46        0.49
          3 |        102        1.02        1.51
          4 |        142        1.42        2.93
          5 |        748        7.48       10.41
          6 |      2,418       24.18       34.59
          7 |      2,666       26.66       61.25
          8 |      2,065       20.65       81.90
          9 |      1,226       12.26       94.16
         10 |        579        5.79       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018