Frequencies for first 10,000 rows of drug4cl2 variable in nhamcsopd2005 dataset :

          ndc code #2 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   anesthetics, topical |          1        0.01        0.01
                              diuretics |         12        0.12        0.13
               calcium channel blockers |          1        0.01        0.14
                          beta blockers |          9        0.09        0.23
           alpha agonist/alpha blockers |         12        0.12        0.35
                     cns, miscellaneous |          1        0.01        0.36
        miscellaneous gastrointestinals |          1        0.01        0.37
                               antacids |          1        0.01        0.38
                      vitamins/minerals |          3        0.03        0.41
               blood glucose regulators |          1        0.01        0.42
                      vaccines/antisera |          2        0.02        0.44
                   dermatologics, misc. |          1        0.01        0.45
                       topical steroids |          1        0.01        0.46
                     topical analgesics |          1        0.01        0.47
          skeletal muscle hyperactivity |          2        0.02        0.49
                oncolytics, unspecified |          1        0.01        0.50
      hormonal/biological response mod. |          1        0.01        0.51
              miscellaneous ophthalmics |          1        0.01        0.52
       vertigo/motion sickness/vomiting |         12        0.12        0.64
                         relief of pain |          1        0.01        0.65
                         antiarthritics |         54        0.54        1.19
                                  nsaid |         16        0.16        1.35
                           antipyretics |         33        0.33        1.68
   antitussives/expectorants/mucolytics |          3        0.03        1.71
                         antihistamines |          5        0.05        1.76
        corticosteroid-inhalation/nasal |          2        0.02        1.78
                    pharmaceutical aids |          3        0.03        1.81
                          surgical aids |          2        0.02        1.83
                   homeopathic products |          1        0.01        1.84
                                      . |      9,816       98.16      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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