Frequencies for first 10,000 rows of rept_cod_num variable in demo2011q2 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        164        1.64        1.64
EXP Expedited (15-Day) |      7,291       72.91       74.55
          PER Periodic |      2,545       25.45      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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