Frequencies for first 10,000 rows of staffmd variable in nhamcsopd2003 dataset :

   staff md |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      2,608       26.08       26.08
        yes |      7,392       73.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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