Frequencies for first 10,000 rows of senbefl variable in namcs2011 dataset :

Seen before |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
Not imputed |      9,927       99.27       99.27
    Imputed |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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