Frequencies for first 10,000 rows of drug1cl2 variable in nhamcsopd2003 dataset :

        drug class #2 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          6        0.06        0.06
                   anesthetics, topical |          4        0.04        0.10
           blood components/substitutes |          1        0.01        0.11
                  antiarrhythmic agents |          2        0.02        0.13
                     antianginal agents |          1        0.01        0.14
                              diuretics |         13        0.13        0.27
                  coronary vasodilators |          1        0.01        0.28
               calcium channel blockers |          5        0.05        0.33
                          beta blockers |         23        0.23        0.56
           alpha agonist/alpha blockers |         14        0.14        0.70
                     cns, miscellaneous |          2        0.02        0.72
                 disorders, acid/peptic |          1        0.01        0.73
                         antidiarrheals |          6        0.06        0.79
                      vitamins/minerals |         15        0.15        0.94
            hematopoietic growth factor |          1        0.01        0.95
                         contraceptives |          1        0.01        0.96
                      vaccines/antisera |          5        0.05        1.01
                          immune serums |          7        0.07        1.08
                   dermatologics, misc. |         32        0.32        1.40
                       topical steroids |          3        0.03        1.43
               dermatitis/antipruritics |          1        0.01        1.44
                     topical analgesics |        134        1.34        2.78
          skeletal muscle hyperactivity |          5        0.05        2.83
      hormonal/biological response mod. |          4        0.04        2.87
ocular anti-infective/anti-inflammatory |          8        0.08        2.95
              miscellaneous ophthalmics |          9        0.09        3.04
       vertigo/motion sickness/vomiting |         19        0.19        3.23
                   analgesics, narcotic |          2        0.02        3.25
                         antiarthritics |         37        0.37        3.62
                               antigout |          1        0.01        3.63
                                  nsaid |         64        0.64        4.27
                           antipyretics |        142        1.42        5.69
                         antiprotozoals |          1        0.01        5.70
                    nasal decongestants |          3        0.03        5.73
   antitussives/expectorants/mucolytics |         20        0.20        5.93
                         antihistamines |          5        0.05        5.98
        corticosteroid-inhalation/nasal |          1        0.01        5.99
                    pharmaceutical aids |          6        0.06        6.05
                                      . |      9,395       93.95      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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