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

    medical |
  screening |
       exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      3,440       34.40       34.40
        yes |      6,560       65.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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