Frequencies for first 10,000 rows of otherbld variable in namcs1994 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,983       79.83       79.83
          1 |      2,017       20.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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