Frequencies for first 10,000 rows of visual variable in nhamcsopd1999 dataset :

     visual |
acuity exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,503       95.03       95.03
          1 |        497        4.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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