Frequencies for first 10,000 rows of prov1880 variable in pos1994 dataset :

        100 |
microbiolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |      1,182       11.82       99.80
          Y |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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