Frequencies for first 10,000 rows of senbefl variable in nhamcsopd2011 dataset :

Seen before |
    imputed |      Freq.     Percent        Cum.
------------+-----------------------------------
Not imputed |      9,745       97.45       97.45
    Imputed |        255        2.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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