Frequencies for first 10,000 rows of senbefl variable in nhamcsopd2006 dataset :

seen before |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
Not imputed |      9,813       98.13       98.13
    Imputed |        187        1.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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