Frequencies for first 10,000 rows of rept_cod_num variable in demo2008q4 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        790        7.90        7.90
EXP Expedited (15-Day) |      7,171       71.71       79.61
          PER Periodic |      2,039       20.39      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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