Frequencies for first 10,000 rows of otherbld variable in nhamcsed2012 dataset :

Other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,730       77.30       77.30
        Yes |      2,270       22.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016