Frequencies for first 10,000 rows of rept_cod_num variable in demo2008q2 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
            DIR Direct |        766        7.66        7.66
EXP Expedited (15-Day) |      5,864       58.64       66.30
          PER Periodic |      3,370       33.70      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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