Frequencies for first 10,000 rows of eyeent variable in nhamcsed1999 dataset :

    eye/ent |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,700       97.00       97.00
          1 |        300        3.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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