Frequencies for first 10,000 rows of chlamyd variable in namcs2013 dataset :

  Chlamydia |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,918       99.18       99.18
        Yes |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017