Frequencies for first 10,000 rows of gestrec10 variable in natl2011 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |         33        0.33        0.34
          3 |         96        0.96        1.30
          4 |        129        1.29        2.59
          5 |        754        7.54       10.13
          6 |      2,446       24.46       34.59
          7 |      2,619       26.19       60.78
          8 |      2,244       22.44       83.22
          9 |      1,066       10.66       93.88
         10 |        589        5.89       99.77
         99 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015