Frequencies for first 10,000 rows of prov1880 variable in pos1995 dataset :

        100 |
microbiolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,884       88.84       88.84
          N |      1,098       10.98       99.82
          Y |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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