Frequencies for first 10,000 rows of rept_cod_num variable in demo2006q3 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        822        8.22        8.22
EXP Expedited (15-Day) |      8,167       81.67       89.89
          PER Periodic |      1,011       10.11      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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