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

 Ton Rating |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,041       80.41       80.41
          B |      1,428       14.28       94.69
         BC |          5        0.05       94.74
          C |        324        3.24       97.98
         CD |          5        0.05       98.03
          D |        186        1.86       99.89
          E |          6        0.06       99.95
         GN |          2        0.02       99.97
          L |          2        0.02       99.99
          P |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016