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

  CT Scan - |
       Head |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,229       92.29       92.29
        Yes |        771        7.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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