Frequencies for first 10,000 rows of prov1915 variable in pos1994 dataset :

150   other |
microbiolog |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |      1,180       11.80       99.78
          Y |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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