Frequencies for first 10,000 rows of suppressionused variable in sdued1991 dataset :

Suppression |
       Used |      Freq.     Percent        Cum.
------------+-----------------------------------
      false |      2,221       22.21       22.21
       true |      7,779       77.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Feb 2018