Frequencies for first 10,000 rows of prov2085 variable in pos1993 dataset :

immunohemat |
 ology test |
        for |
   transfus |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |      1,107       11.07       99.04
          Y |         96        0.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016