Frequencies for first 10,000 rows of eyeent variable in nhamcsed1998 dataset :

    eye/ent |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,652       96.52       96.52
          1 |        348        3.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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