Frequencies for first 10,000 rows of prov1900 variable in pos1995 dataset :

        130 |
parasitolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,884       88.84       88.84
          N |        748        7.48       96.32
          Y |        368        3.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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