Frequencies for first 10,000 rows of compref variable in namcs2014 dataset :

       Considered in |
         determining |
       compensation: |
   refused to answer |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Box is not marked |      9,860       98.60       98.60
       Box is marked |        140        1.40      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017