Frequencies for first 10,000 rows of gestat10 variable in natlterr1995 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         55        0.55        0.55
          3 |        136        1.36        1.91
          4 |        550        5.50        7.41
          5 |        475        4.75       12.16
          6 |      5,117       51.17       63.33
          7 |      2,219       22.19       85.52
          8 |        990        9.90       95.42
          9 |        452        4.52       99.94
         10 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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