Frequencies for first 10,000 rows of othblood variable in namcs2003 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,301       93.01       93.01
          1 |        699        6.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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