Frequencies for first 10,000 rows of rept_cod_num variable in demo2008q3 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        932        9.32        9.32
EXP Expedited (15-Day) |      7,729       77.29       86.61
          PER Periodic |      1,339       13.39      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015