Frequencies for first 10,000 rows of ton_rat variable in person dataset :

 ton rating |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,191       81.91       81.91
          B |      1,390       13.90       95.81
         BC |          1        0.01       95.82
          C |        242        2.42       98.24
         CD |          1        0.01       98.25
          D |        174        1.74       99.99
          E |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016