Frequencies for first 10,000 rows of occp_cod_num variable in demo2009q1 dataset :

                occp_cod_num |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                 CN Consumer |      3,219       32.19       32.19
                   LW Lawyer |        132        1.32       33.51
                MD Physician |      3,000       30.00       63.51
OT Other health-professional |      1,914       19.14       82.65
               PH Pharmacist |        593        5.93       88.58
                           . |      1,142       11.42      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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