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

 Ton Rating |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,055       80.55       80.55
          B |      1,422       14.22       94.77
         BC |          4        0.04       94.81
          C |        298        2.98       97.79
         CD |          5        0.05       97.84
          D |        210        2.10       99.94
          E |          3        0.03       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