Frequencies for first 10,000 rows of prov1900 variable in pos1994 dataset :

        130 |
parasitolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |        797        7.97       95.95
          Y |        405        4.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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