Frequencies for first 10,000 rows of suppressionused variable in sdued1997 dataset :

Suppression |
       Used |      Freq.     Percent        Cum.
------------+-----------------------------------
      false |      3,141       31.41       31.41
       true |      6,859       68.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 12 Feb 2018