Frequencies for first 10,000 rows of prov2085 variable in pos1995 dataset :

immunohemat |
 ology test |
        for |
   transfus |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,884       88.84       88.84
          N |      1,023       10.23       99.07
          Y |         93        0.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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