Frequencies for first 10,000 rows of prov2005 variable in pos1991 dataset :

 620   oral |
  pathology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |      1,166       11.66       97.02
          Y |        298        2.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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