Frequencies for first 10,000 rows of cervcx variable in nhamcsopd2004 dataset :

cervical/ur |
     ethral |
    culture |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,781       97.81       97.81
        yes |        219        2.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016