Frequencies for first 10,000 rows of uterine variable in natl1996 dataset :

    Uterine |
   bleeding |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         61        0.61        0.61
          2 |      9,911       99.11       99.72
          8 |          1        0.01       99.73
          9 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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