Frequencies for first 10,000 rows of prov2000 variable in pos1991 dataset :

        610 |
histopathol |
        ogy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |      1,119       11.19       96.55
          Y |        345        3.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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