Frequencies for first 10,000 rows of tono variable in namcs2014 dataset :

  Tonometry |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,971       99.71       99.71
        Yes |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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