Frequencies for first 10,000 rows of prov1915 variable in pos1993 dataset :

150   other |
microbiolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |      1,181       11.81       99.78
          Y |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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