Frequencies for first 10,000 rows of drug2cl2 variable in nhamcsopd2003 dataset :

        drug class #2 for medication #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          4        0.04        0.04
                   anesthetics, topical |          2        0.02        0.06
                  antiarrhythmic agents |          1        0.01        0.07
                              diuretics |          6        0.06        0.13
               calcium channel blockers |          3        0.03        0.16
                          beta blockers |         34        0.34        0.50
           alpha agonist/alpha blockers |         14        0.14        0.64
                 disorders, acid/peptic |          2        0.02        0.66
                         antidiarrheals |          5        0.05        0.71
        antispasmodics/anticholinergics |          3        0.03        0.74
                      vitamins/minerals |         11        0.11        0.85
                      vaccines/antisera |          5        0.05        0.90
                   dermatologics, misc. |         11        0.11        1.01
                       topical steroids |          2        0.02        1.03
                     topical analgesics |         37        0.37        1.40
          skeletal muscle hyperactivity |          5        0.05        1.45
         antineoplastics, miscellaneous |          1        0.01        1.46
      hormonal/biological response mod. |          2        0.02        1.48
                cycloplegics/mydriatics |          7        0.07        1.55
              miscellaneous ophthalmics |          5        0.05        1.60
       vertigo/motion sickness/vomiting |         31        0.31        1.91
                   analgesics, narcotic |          1        0.01        1.92
                         antiarthritics |         64        0.64        2.56
                                  nsaid |         38        0.38        2.94
                           antipyretics |        100        1.00        3.94
                         antiprotozoals |          1        0.01        3.95
                    nasal decongestants |          1        0.01        3.96
   antitussives/expectorants/mucolytics |         11        0.11        4.07
                         antihistamines |          5        0.05        4.12
        corticosteroid-inhalation/nasal |          6        0.06        4.18
                    pharmaceutical aids |          2        0.02        4.20
                                      . |      9,580       95.80      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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