Frequencies for first 10,000 rows of rept_cod_num variable in demo2012q4 dataset :

          rept_cod_num |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
EXP Expedited (15-Day) |      8,149       81.49       81.49
          PER Periodic |      1,851       18.51      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Apr 2017