Frequencies for first 10,000 rows of visual variable in nhamcsopd1997 dataset :

     visual |
acuity exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,357       93.57       93.57
          1 |        643        6.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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