Frequencies for first 10,000 rows of drug2cl2 variable in nhamcsed2004 dataset :

        drug class #2 for medication #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          9        0.09        0.09
                         cephalosporins |          1        0.01        0.10
          sulfonamides and trimethoprim |          1        0.01        0.11
                  antiarrhythmic agents |          8        0.08        0.19
                antihypertensive agents |          4        0.04        0.23
                              diuretics |         14        0.14        0.37
               calcium channel blockers |          2        0.02        0.39
                          beta blockers |         16        0.16        0.55
           alpha agonist/alpha blockers |         12        0.12        0.67
                 disorders, acid/peptic |          3        0.03        0.70
                         antidiarrheals |         14        0.14        0.84
        miscellaneous gastrointestinals |          1        0.01        0.85
        antispasmodics/anticholinergics |          4        0.04        0.89
                               antacids |          1        0.01        0.90
                      vitamins/minerals |          3        0.03        0.93
                       immunomodulators |          1        0.01        0.94
                          immune serums |          3        0.03        0.97
      skin/mucous membrane, unspecified |          1        0.01        0.98
                   dermatologics, misc. |         16        0.16        1.14
                       topical steroids |          2        0.02        1.16
               dermatitis/antipruritics |          1        0.01        1.17
                     topical analgesics |         27        0.27        1.44
          skeletal muscle hyperactivity |         35        0.35        1.79
                        anticonvulsants |          1        0.01        1.80
                cycloplegics/mydriatics |          8        0.08        1.88
ocular anti-infective/anti-inflammatory |          7        0.07        1.95
              miscellaneous ophthalmics |          8        0.08        2.03
       vertigo/motion sickness/vomiting |        384        3.84        5.87
                   analgesics, narcotic |         18        0.18        6.05
               analgesics, non-narcotic |          3        0.03        6.08
                         antiarthritics |         83        0.83        6.91
                                  nsaid |         24        0.24        7.15
                           antipyretics |        246        2.46        9.61
         antiasthmatics/bronchodilators |          1        0.01        9.62
                    nasal decongestants |          1        0.01        9.63
   antitussives/expectorants/mucolytics |         33        0.33        9.96
                         antihistamines |         13        0.13       10.09
        corticosteroid-inhalation/nasal |          1        0.01       10.10
                           unclassified |          1        0.01       10.11
                    pharmaceutical aids |         59        0.59       10.70
                                      . |      8,930       89.30      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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