Frequencies for first 10,000 rows of gestrec10 variable in natlterr2003 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         52        0.52        0.52
          3 |        122        1.22        1.74
          4 |        767        7.67        9.41
          5 |        782        7.82       17.23
          6 |      6,513       65.13       82.36
          7 |      1,312       13.12       95.48
          8 |        288        2.88       98.36
          9 |        159        1.59       99.95
         10 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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