Frequencies for first 10,000 rows of ctunk variable in nhamcsed2011 dataset :

  CT Scan - |
   Site not |
  specified |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,921       99.21       99.21
        Yes |         79        0.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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