Frequencies for first 10,000 rows of staffmd variable in nhamcsopd2002 dataset :

   staff md |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,777       17.77       17.77
          1 |      8,223       82.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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