Frequencies for first 10,000 rows of drug2cl3 variable in nhamcsopd2003 dataset :

        drug class #3 for medication #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          4        0.04        0.04
repl/regs of electrolytes/water balance |          2        0.02        0.06
                topical anti-infectives |          1        0.01        0.07
                        anticonvulsants |         10        0.10        0.17
                cycloplegics/mydriatics |          3        0.03        0.20
ocular anti-infective/anti-inflammatory |          4        0.04        0.24
                           antipyretics |         64        0.64        0.88
                          antimalarials |          1        0.01        0.89
         antiasthmatics/bronchodilators |          7        0.07        0.96
   antitussives/expectorants/mucolytics |          1        0.01        0.97
                         antihistamines |         31        0.31        1.28
                          cold remedies |          5        0.05        1.33
                                      . |      9,867       98.67      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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