Frequencies for first 10,000 rows of confid variable in demo2009q4 dataset :

 Whether or |
  not (Y/N) |
  voluntary |
   reporter |
  disclosed |
   identity |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,486       94.86       94.86
          N |        300        3.00       97.86
          Y |        214        2.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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