Frequencies for first 10,000 rows of gestat10 variable in natl2000 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |         98        0.98        1.00
          3 |        152        1.52        2.52
          4 |        694        6.94        9.46
          5 |        542        5.42       14.88
          6 |      5,103       51.03       65.91
          7 |      1,799       17.99       83.90
          8 |        848        8.48       92.38
          9 |        752        7.52       99.90
         10 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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