Frequencies for first 10,000 rows of visual variable in nhamcsopd1995 dataset :

     visual |
     acuity |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,605       96.05       96.05
          1 |        395        3.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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