Frequencies for first 10,000 rows of gestat10 variable in natlterr2001 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         68        0.68        0.68
          3 |        130        1.30        1.98
          4 |        679        6.79        8.77
          5 |        730        7.30       16.07
          6 |      6,213       62.13       78.20
          7 |      1,540       15.40       93.60
          8 |        433        4.33       97.93
          9 |        204        2.04       99.97
         10 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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