Frequencies for first 10,000 rows of gestat10 variable in natl1995 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |         78        0.78        0.79
          3 |        152        1.52        2.31
          4 |        629        6.29        8.60
          5 |        417        4.17       12.77
          6 |      4,587       45.87       58.64
          7 |      2,041       20.41       79.05
          8 |      1,092       10.92       89.97
          9 |        992        9.92       99.89
         10 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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