Frequencies for first 10,000 rows of gestat10 variable in linkco1991us_num dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        230        2.30        2.30
          2 |      3,449       34.49       36.79
          3 |        855        8.55       45.34
          4 |        968        9.68       55.02
          5 |        344        3.44       58.46
          6 |      1,916       19.16       77.62
          7 |        716        7.16       84.78
          8 |        465        4.65       89.43
          9 |        462        4.62       94.05
         10 |        595        5.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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