Frequencies for first 10,000 rows of drug1cl2 variable in nhamcsed2004 dataset :

        drug class #2 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |         15        0.15        0.15
                   anesthetics, topical |          1        0.01        0.16
          sulfonamides and trimethoprim |          4        0.04        0.20
                  antiarrhythmic agents |          6        0.06        0.26
                              diuretics |          8        0.08        0.34
               calcium channel blockers |          2        0.02        0.36
                          beta blockers |         11        0.11        0.47
           alpha agonist/alpha blockers |          3        0.03        0.50
                 disorders, acid/peptic |          3        0.03        0.53
                         antidiarrheals |          2        0.02        0.55
        miscellaneous gastrointestinals |          3        0.03        0.58
        antispasmodics/anticholinergics |          3        0.03        0.61
                      vitamins/minerals |          3        0.03        0.64
repl/regs of electrolytes/water balance |          5        0.05        0.69
                         contraceptives |          1        0.01        0.70
                          immune serums |         14        0.14        0.84
              antiseptics/disinfectants |          4        0.04        0.88
                   dermatologics, misc. |         17        0.17        1.05
                       topical steroids |          2        0.02        1.07
                          acne products |          1        0.01        1.08
                     topical analgesics |         50        0.50        1.58
          skeletal muscle hyperactivity |         23        0.23        1.81
                cycloplegics/mydriatics |          9        0.09        1.90
ocular anti-infective/anti-inflammatory |          5        0.05        1.95
              miscellaneous ophthalmics |         18        0.18        2.13
       vertigo/motion sickness/vomiting |        254        2.54        4.67
                   analgesics, narcotic |         29        0.29        4.96
               analgesics, non-narcotic |          3        0.03        4.99
           antimigraine/other headaches |          3        0.03        5.02
                         antiarthritics |        102        1.02        6.04
                                  nsaid |         37        0.37        6.41
                           antipyretics |        483        4.83       11.24
   antitussives/expectorants/mucolytics |         39        0.39       11.63
                         antihistamines |         11        0.11       11.74
                          cold remedies |          1        0.01       11.75
                    pharmaceutical aids |        129        1.29       13.04
                                      . |      8,696       86.96      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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