Frequencies for first 10,000 rows of gestrec10 variable in natl2008 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |        111        1.11        1.16
          3 |        175        1.75        2.91
          4 |        250        2.50        5.41
          5 |      1,103       11.03       16.44
          6 |      5,751       57.51       73.95
          7 |      1,376       13.76       87.71
          8 |        599        5.99       93.70
          9 |        622        6.22       99.92
         10 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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