Frequencies for first 10,000 rows of uterine variable in linkco1991us_num dataset :

    Uterine |
   bleeding |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        285        2.85        2.85
          2 |      9,431       94.31       97.16
          8 |          4        0.04       97.20
          9 |        280        2.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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