Frequencies for first 10,000 rows of pastfl variable in nhamcsopd2010 dataset :

  number of |
past visits |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      8,397       83.97       83.97
    imputed |      1,603       16.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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