Frequencies for first 10,000 rows of confid variable in demo2004q4 dataset :

 Whether or |
  not (Y/N) |
  voluntary |
   reporter |
  disclosed |
   identity |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,790       87.90       87.90
          N |        775        7.75       95.65
          Y |        435        4.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015