Frequencies for first 10,000 rows of visual variable in namcs1999 dataset :

     visual |
     acuity |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,252       92.52       92.52
          1 |        748        7.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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