Frequencies for first 10,000 rows of gestat10 variable in natl1994 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.04        0.04
          2 |         79        0.79        0.83
          3 |        188        1.88        2.71
          4 |        682        6.82        9.53
          5 |        465        4.65       14.18
          6 |      4,332       43.32       57.50
          7 |      2,040       20.40       77.90
          8 |      1,192       11.92       89.82
          9 |      1,010       10.10       99.92
         10 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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