Frequencies for first 10,000 rows of senbefl variable in namcs2006 dataset :

seen before |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      9,644       96.44       96.44
    imputed |        356        3.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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