Frequencies for first 10,000 rows of othblood variable in namcs2002 dataset :

Other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,094       90.94       90.94
        Yes |        906        9.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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