Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsopd2003 dataset :

  ingredient code #4 for medication |
                                 #2 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                             pectin |          1        0.01        0.01
                  phenyl salicylate |          1        0.01        0.02
                      potassium ion |          2        0.02        0.04
                         riboflavin |          1        0.01        0.05
                           silicone |          1        0.01        0.06
                    sodium chloride |          8        0.08        0.14
                           thiamine |         35        0.35        0.49
                       vitamin b-12 |          1        0.01        0.50
                                fat |          1        0.01        0.51
          dextroamphetamine sulfate |         11        0.11        0.62
             hydrocortisone acetate |          2        0.02        0.64
               dextromethorphan hbr |          1        0.01        0.65
                diphenhydramine hcl |          1        0.01        0.66
                   neomycin sulfate |          1        0.01        0.67
        acellular pertussis vaccine |          1        0.01        0.68
                    woolwax alcohol |          1        0.01        0.69
          filamentous hemagglutinin |          2        0.02        0.71
                                  . |      9,929       99.29      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016