Frequencies for first 10,000 rows of gestat10 variable in natlterr2000 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         65        0.65        0.65
          3 |        123        1.23        1.88
          4 |        672        6.72        8.60
          5 |        620        6.20       14.80
          6 |      5,837       58.37       73.17
          7 |      1,889       18.89       92.06
          8 |        547        5.47       97.53
          9 |        245        2.45       99.98
         10 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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