Frequencies for first 10,000 rows of drug1cl2 variable in nhamcsopd2005 dataset :

          ndc code #2 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          1        0.01        0.01
                     antianginal agents |         22        0.22        0.23
                              diuretics |         17        0.17        0.40
               calcium channel blockers |          2        0.02        0.42
                          beta blockers |         15        0.15        0.57
           alpha agonist/alpha blockers |         18        0.18        0.75
                         antidiarrheals |          3        0.03        0.78
                              laxatives |          1        0.01        0.79
        miscellaneous gastrointestinals |          1        0.01        0.80
                      vitamins/minerals |         11        0.11        0.91
                   estrogens/progestins |          1        0.01        0.92
               blood glucose regulators |          3        0.03        0.95
                         contraceptives |          7        0.07        1.02
                      vaccines/antisera |          7        0.07        1.09
                          immune serums |          4        0.04        1.13
      skin/mucous membrane, unspecified |          1        0.01        1.14
                   dermatologics, misc. |         20        0.20        1.34
                       topical steroids |          1        0.01        1.35
                          acne products |          2        0.02        1.37
               dermatitis/antipruritics |          3        0.03        1.40
                     topical analgesics |         56        0.56        1.96
          skeletal muscle hyperactivity |         17        0.17        2.13
      hormonal/biological response mod. |          3        0.03        2.16
ocular anti-infective/anti-inflammatory |          6        0.06        2.22
              miscellaneous ophthalmics |          2        0.02        2.24
       vertigo/motion sickness/vomiting |         21        0.21        2.45
                         relief of pain |          1        0.01        2.46
                   analgesics, narcotic |         17        0.17        2.63
               analgesics, non-narcotic |          1        0.01        2.64
           antimigraine/other headaches |          3        0.03        2.67
                         antiarthritics |         65        0.65        3.32
                                  nsaid |         43        0.43        3.75
                           antipyretics |        145        1.45        5.20
                          antimalarials |          1        0.01        5.21
   antitussives/expectorants/mucolytics |         20        0.20        5.41
                         antihistamines |         22        0.22        5.63
        corticosteroid-inhalation/nasal |          2        0.02        5.65
                    pharmaceutical aids |         72        0.72        6.37
                          surgical aids |          1        0.01        6.38
                                      . |      9,362       93.62      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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