Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsopd2005 dataset :

ingredient code #4 for medication #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          petrolatum |          5        0.05        0.05
                 phenylpropanolamine |          1        0.01        0.06
                       potassium ion |          1        0.01        0.07
                          riboflavin |          3        0.03        0.10
                         soybean oil |          2        0.02        0.12
                            thiamine |         71        0.71        0.83
                           vitamin c |          2        0.02        0.85
                           vitamin e |          1        0.01        0.86
   zinc topical agents, external use |          1        0.01        0.87
                     mineral spirits |          1        0.01        0.88
           dextroamphetamine sulfate |          4        0.04        0.92
              hydrocortisone acetate |          2        0.02        0.94
                 hyoscyamine sulfate |          1        0.01        0.95
                dextromethorphan hbr |          1        0.01        0.96
                  pyrilamine maleate |          1        0.01        0.97
                     woolwax alcohol |          5        0.05        1.02
           filamentous hemagglutinin |          3        0.03        1.05
                           potassium |          1        0.01        1.06
                                   . |      9,894       98.94      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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