Frequencies for first 10,000 rows of prov2015 variable in pos1991 dataset :

        800 |
radiobioass |
         ay |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |      1,451       14.51       99.87
          Y |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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