Frequencies for first 10,000 rows of vworkrel variable in nhamcsed2004 dataset :

    is this |
 visit work |
   related? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        217        2.17        2.17
        yes |        306        3.06        5.23
         no |      9,173       91.73       96.96
    unknown |        304        3.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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