Frequencies for first 10,000 rows of vtimefl variable in nhamcsed1999 dataset :

  was visit |
       time |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,736       97.36       97.36
          1 |        264        2.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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