Frequencies for first 10,000 rows of prov1900 variable in pos1991 dataset :

        130 |
parasitolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |        903        9.03       94.39
          Y |        561        5.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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