Frequencies for first 10,000 rows of provfl variable in nhamcsopd1992 dataset :

        Was |
   provider |
       seen |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,170       91.70       91.70
          1 |        830        8.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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