Frequencies for first 10,000 rows of senbefl variable in namcs2007 dataset :

seen before |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      9,729       97.29       97.29
    imputed |        271        2.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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