Frequencies for first 10,000 rows of prov2085 variable in pos1994 dataset :

immunohemat |
 ology test |
        for |
   transfus |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |      1,108       11.08       99.06
          Y |         94        0.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017