Frequencies for first 10,000 rows of medtech variable in nhamcsopd2004 dataset :

   med tech |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,917       89.17       89.17
        yes |      1,083       10.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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