Frequencies for first 10,000 rows of senbefl variable in namcs2005 dataset :

seen before |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,706       97.06       97.06
          1 |        294        2.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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