Frequencies for first 10,000 rows of drug4cl2 variable in nhamcsed2004 dataset :

        drug class #2 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          5        0.05        0.05
          sulfonamides and trimethoprim |          1        0.01        0.06
                  antiarrhythmic agents |          2        0.02        0.08
                              diuretics |         12        0.12        0.20
               calcium channel blockers |          1        0.01        0.21
                          beta blockers |         13        0.13        0.34
           alpha agonist/alpha blockers |          6        0.06        0.40
                     cns, miscellaneous |          1        0.01        0.41
                 disorders, acid/peptic |          2        0.02        0.43
                              laxatives |          1        0.01        0.44
        miscellaneous gastrointestinals |          1        0.01        0.45
        antispasmodics/anticholinergics |          1        0.01        0.46
          nutrition, enteral/parenteral |          1        0.01        0.47
repl/regs of electrolytes/water balance |          3        0.03        0.50
               blood glucose regulators |          1        0.01        0.51
                          immune serums |          2        0.02        0.53
      skin/mucous membrane, unspecified |          1        0.01        0.54
                   dermatologics, misc. |          4        0.04        0.58
                       topical steroids |          1        0.01        0.59
                     topical analgesics |          4        0.04        0.63
          skeletal muscle hyperactivity |          7        0.07        0.70
                cycloplegics/mydriatics |          1        0.01        0.71
ocular anti-infective/anti-inflammatory |          5        0.05        0.76
              miscellaneous ophthalmics |          3        0.03        0.79
       vertigo/motion sickness/vomiting |         61        0.61        1.40
                   analgesics, narcotic |         11        0.11        1.51
               analgesics, non-narcotic |          1        0.01        1.52
                         antiarthritics |         23        0.23        1.75
                                  nsaid |         10        0.10        1.85
                           antipyretics |         70        0.70        2.55
   antitussives/expectorants/mucolytics |         11        0.11        2.66
                         antihistamines |          3        0.03        2.69
                          cold remedies |          1        0.01        2.70
                    pharmaceutical aids |         25        0.25        2.95
                                      . |      9,705       97.05      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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