Frequencies for first 10,000 rows of prov1995 variable in pos1991 dataset :

        600 |
  pathology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |      1,193       11.93       97.29
          Y |        271        2.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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