Frequencies for first 10,000 rows of othblood variable in nhamcsopd2004 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,725       87.25       87.25
        yes |      1,275       12.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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