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

    Uterine |
   bleeding |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         29        0.29        0.29
          2 |      9,656       96.56       96.85
          8 |          2        0.02       96.87
          9 |        313        3.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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