Frequencies for first 10,000 rows of rept_cod_num variable in demo2012q2 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        280        2.80        2.80
EXP Expedited (15-Day) |      6,022       60.22       63.02
          PER Periodic |      3,698       36.98      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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