Frequencies for first 10,000 rows of drug1cl2 variable in nhamcsed2005 dataset :

          ndc code #2 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |         15        0.15        0.15
          sulfonamides and trimethoprim |          3        0.03        0.18
                  antiarrhythmic agents |          4        0.04        0.22
                antihypertensive agents |          2        0.02        0.24
                              diuretics |          2        0.02        0.26
               calcium channel blockers |          1        0.01        0.27
                          beta blockers |          4        0.04        0.31
                 disorders, acid/peptic |          3        0.03        0.34
                         antidiarrheals |          2        0.02        0.36
        antispasmodics/anticholinergics |          3        0.03        0.39
                               antacids |          1        0.01        0.40
                      vitamins/minerals |          2        0.02        0.42
repl/regs of electrolytes/water balance |          4        0.04        0.46
                          immune serums |          3        0.03        0.49
                   dermatologics, misc. |         19        0.19        0.68
                       topical steroids |          2        0.02        0.70
                          acne products |          1        0.01        0.71
               dermatitis/antipruritics |          1        0.01        0.72
                     topical analgesics |         54        0.54        1.26
          skeletal muscle hyperactivity |         24        0.24        1.50
                cycloplegics/mydriatics |         15        0.15        1.65
ocular anti-infective/anti-inflammatory |          5        0.05        1.70
              miscellaneous ophthalmics |         19        0.19        1.89
       vertigo/motion sickness/vomiting |        258        2.58        4.47
                   analgesics, narcotic |         26        0.26        4.73
               analgesics, non-narcotic |          6        0.06        4.79
                         antiarthritics |        137        1.37        6.16
                                  nsaid |         19        0.19        6.35
                           antipyretics |        546        5.46       11.81
   antitussives/expectorants/mucolytics |         15        0.15       11.96
                         antihistamines |         13        0.13       12.09
                          cold remedies |          1        0.01       12.10
                    pharmaceutical aids |        192        1.92       14.02
                                      . |      8,598       85.98      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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