Frequencies for first 10,000 rows of staffmd variable in nhamcsopd2001 dataset :

   staff md |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,823       18.23       18.23
          1 |      8,177       81.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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