Frequencies for first 10,000 rows of rept_cod_num variable in demo2004q4 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |      1,210       12.10       12.10
EXP Expedited (15-Day) |      8,013       80.13       92.23
          PER Periodic |        777        7.77      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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