Frequencies for first 10,000 rows of prov1900 variable in pos1993 dataset :

        130 |
parasitolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |        798        7.98       95.95
          Y |        405        4.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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