Frequencies for first 10,000 rows of uterine variable in natl1997 dataset :

    Uterine |
   bleeding |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         70        0.70        0.70
          2 |      9,919       99.19       99.89
          8 |          2        0.02       99.91
          9 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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