Frequencies for first 10,000 rows of prov1925 variable in pos1993 dataset :

        210 |
   syphilis |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |        755        7.55       95.52
          Y |        448        4.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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