Frequencies for first 10,000 rows of eyeent variable in nhamcsed2004 dataset :

    eye/ent |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,581       95.81       95.81
        yes |        419        4.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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