Frequencies for first 10,000 rows of prov1925 variable in pos1994 dataset :

        210 |
   syphilis |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |        753        7.53       95.51
          Y |        449        4.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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