Frequencies for first 10,000 rows of prov2015 variable in pos1993 dataset :

        800 |
radiobioass |
         ay |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |      1,194       11.94       99.91
          Y |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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