Frequencies for first 10,000 rows of othblood variable in namcs2001 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,209       92.09       92.09
          1 |        791        7.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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