Frequencies for first 10,000 rows of rept_cod_num variable in demo2011q3 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        297        2.97        2.97
EXP Expedited (15-Day) |      7,465       74.65       77.62
          PER Periodic |      2,238       22.38      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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