Frequencies for first 10,000 rows of compref variable in namcs2012 dataset :

    Considered in |
        determing |
    compensation: |
refused to answer |      Freq.     Percent        Cum.
------------------+-----------------------------------
Box is not marked |      9,943       99.43       99.43
    Box is marked |         57        0.57      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016