Frequencies for first 10,000 rows of cervcx variable in namcs2002 dataset :

   Cervical |
    culture |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,973       99.73       99.73
        Yes |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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