Frequencies for first 10,000 rows of gestat10 variable in natl2002 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |         40        0.40        0.41
          3 |         68        0.68        1.09
          4 |        460        4.60        5.69
          5 |        396        3.96        9.65
          6 |      5,018       50.18       59.83
          7 |      2,210       22.10       81.93
          8 |      1,209       12.09       94.02
          9 |        551        5.51       99.53
         10 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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