Frequencies for first 10,000 rows of prov2010 variable in pos1994 dataset :

        630 |
   cytology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |        887        8.87       96.85
          Y |        315        3.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017