Frequencies for first 10,000 rows of drug1cl2 variable in nhamcsed2003 dataset :

        drug class #2 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |         18        0.18        0.18
                   anesthetics, topical |          2        0.02        0.20
          sulfonamides and trimethoprim |          3        0.03        0.23
                  antiarrhythmic agents |          7        0.07        0.30
                              diuretics |          4        0.04        0.34
                  coronary vasodilators |          2        0.02        0.36
               calcium channel blockers |          1        0.01        0.37
                          beta blockers |          4        0.04        0.41
           alpha agonist/alpha blockers |          2        0.02        0.43
                     cns, miscellaneous |          1        0.01        0.44
                 disorders, acid/peptic |          2        0.02        0.46
                         antidiarrheals |          8        0.08        0.54
        miscellaneous gastrointestinals |          2        0.02        0.56
                      vitamins/minerals |          4        0.04        0.60
repl/regs of electrolytes/water balance |          2        0.02        0.62
                      vaccines/antisera |          1        0.01        0.63
                       immunomodulators |          3        0.03        0.66
                          immune serums |          1        0.01        0.67
      skin/mucous membrane, unspecified |          1        0.01        0.68
              antiseptics/disinfectants |          1        0.01        0.69
                   dermatologics, misc. |         28        0.28        0.97
                       topical steroids |          2        0.02        0.99
                     topical analgesics |         62        0.62        1.61
          skeletal muscle hyperactivity |         31        0.31        1.92
                cycloplegics/mydriatics |         15        0.15        2.07
ocular anti-infective/anti-inflammatory |          7        0.07        2.14
              miscellaneous ophthalmics |         16        0.16        2.30
       vertigo/motion sickness/vomiting |        229        2.29        4.59
                   analgesics, narcotic |         47        0.47        5.06
               analgesics, non-narcotic |          3        0.03        5.09
           antimigraine/other headaches |          1        0.01        5.10
                         antiarthritics |        122        1.22        6.32
                                  nsaid |         41        0.41        6.73
                           antipyretics |        488        4.88       11.61
                    nasal decongestants |          1        0.01       11.62
   antitussives/expectorants/mucolytics |         15        0.15       11.77
                         antihistamines |         16        0.16       11.93
        corticosteroid-inhalation/nasal |          1        0.01       11.94
                    pharmaceutical aids |        178        1.78       13.72
                                      . |      8,628       86.28      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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