Frequencies for first 10,000 rows of prov2085 variable in pos1991 dataset :

immunohemat |
 ology test |
        for |
   transfus |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |      1,341       13.41       98.77
          Y |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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