Frequencies for first 10,000 rows of retinal variable in namcs2015 dataset :

Retinal/Eye |
       exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,265       82.65       82.65
          1 |      1,735       17.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017