Frequencies for first 10,000 rows of prov2010 variable in pos1995 dataset :

        630 |
   cytology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,884       88.84       88.84
          N |        826        8.26       97.10
          Y |        290        2.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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