Frequencies for first 10,000 rows of gestrec10 variable in natl2006 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         56        0.56        0.56
          3 |         95        0.95        1.51
          4 |        106        1.06        2.57
          5 |        836        8.36       10.93
          6 |      5,078       50.78       61.71
          7 |      2,133       21.33       83.04
          8 |      1,101       11.01       94.05
          9 |        585        5.85       99.90
         10 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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