Frequencies for first 10,000 rows of drug7cl2 variable in nhamcsed2004 dataset :

        drug class #2 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          3        0.03        0.03
          sulfonamides and trimethoprim |          1        0.01        0.04
                              diuretics |          3        0.03        0.07
                          beta blockers |          3        0.03        0.10
           alpha agonist/alpha blockers |          2        0.02        0.12
                         antidiarrheals |          1        0.01        0.13
                   dermatologics, misc. |          3        0.03        0.16
                     topical analgesics |          2        0.02        0.18
          skeletal muscle hyperactivity |          1        0.01        0.19
       vertigo/motion sickness/vomiting |          9        0.09        0.28
                   analgesics, narcotic |          2        0.02        0.30
                         antiarthritics |         13        0.13        0.43
                                  nsaid |         10        0.10        0.53
                           antipyretics |         13        0.13        0.66
   antitussives/expectorants/mucolytics |          2        0.02        0.68
                    pharmaceutical aids |          6        0.06        0.74
                                      . |      9,926       99.26      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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