Frequencies for first 10,000 rows of uterine variable in natlterr1994 dataset :

    Uterine |
   bleeding |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         32        0.32        0.32
          2 |      9,956       99.56       99.88
          9 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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