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

   Was `Was |
    patient |
       seen |
   before?` |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,745       97.45       97.45
          1 |        255        2.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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