Frequencies for first 10,000 rows of drug4cl2 variable in nhamcsopd2003 dataset :

        drug class #2 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          3        0.03        0.03
                   anesthetics, topical |          1        0.01        0.04
                antihypertensive agents |          1        0.01        0.05
                              diuretics |          7        0.07        0.12
               calcium channel blockers |          1        0.01        0.13
                          beta blockers |          7        0.07        0.20
           alpha agonist/alpha blockers |          7        0.07        0.27
        antispasmodics/anticholinergics |          1        0.01        0.28
                      vitamins/minerals |          4        0.04        0.32
repl/regs of electrolytes/water balance |          1        0.01        0.33
                         contraceptives |          2        0.02        0.35
                      vaccines/antisera |          2        0.02        0.37
                   dermatologics, misc. |          3        0.03        0.40
                     topical analgesics |          7        0.07        0.47
          skeletal muscle hyperactivity |          3        0.03        0.50
      hormonal/biological response mod. |          1        0.01        0.51
                cycloplegics/mydriatics |          6        0.06        0.57
ocular anti-infective/anti-inflammatory |          1        0.01        0.58
       vertigo/motion sickness/vomiting |         11        0.11        0.69
                   analgesics, narcotic |          1        0.01        0.70
               analgesics, non-narcotic |          1        0.01        0.71
           antimigraine/other headaches |          1        0.01        0.72
                         antiarthritics |         40        0.40        1.12
                                  nsaid |         16        0.16        1.28
                           antipyretics |         33        0.33        1.61
                         antiprotozoals |          1        0.01        1.62
   antitussives/expectorants/mucolytics |          2        0.02        1.64
        corticosteroid-inhalation/nasal |          1        0.01        1.65
                    pharmaceutical aids |          2        0.02        1.67
                   homeopathic products |          1        0.01        1.68
                                      . |      9,832       98.32      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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