Frequencies for first 10,000 rows of otherbld variable in nhamcsed2004 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,948       79.48       79.48
        yes |      2,052       20.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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