Frequencies for first 10,000 rows of pastfl variable in nhamcsopd2005 dataset :

  number of |
past visits |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      9,260       92.60       92.60
    imputed |        740        7.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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