Frequencies for first 10,000 rows of gestrec10 variable in natl2007 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |         49        0.49        0.50
          3 |         90        0.90        1.40
          4 |        126        1.26        2.66
          5 |        763        7.63       10.29
          6 |      5,095       50.95       61.24
          7 |      2,232       22.32       83.56
          8 |      1,044       10.44       94.00
          9 |        584        5.84       99.84
         10 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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