Frequencies for first 10,000 rows of gestrec10 variable in natl2005 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.04        0.04
          2 |         34        0.34        0.38
          3 |         85        0.85        1.23
          4 |        490        4.90        6.13
          5 |        425        4.25       10.38
          6 |      5,268       52.68       63.06
          7 |      2,167       21.67       84.73
          8 |      1,019       10.19       94.92
          9 |        494        4.94       99.86
         10 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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