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

Other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,853       78.53       78.53
        Yes |      2,147       21.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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