Frequencies for first 10,000 rows of ctunk variable in nhamcsed2010 dataset :

  CT Scan - |
   site not |
  specified |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,902       99.02       99.02
        yes |         98        0.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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