Frequencies for first 10,000 rows of drug4cl3 variable in nhamcsed2004 dataset :

        drug class #3 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
        miscellaneous gastrointestinals |          1        0.01        0.02
repl/regs of electrolytes/water balance |          2        0.02        0.04
                     topical analgesics |          1        0.01        0.05
                        anticonvulsants |          9        0.09        0.14
                cycloplegics/mydriatics |          1        0.01        0.15
                           antipyretics |         23        0.23        0.38
         antiasthmatics/bronchodilators |          1        0.01        0.39
                         antihistamines |         58        0.58        0.97
                          cold remedies |          3        0.03        1.00
                          surgical aids |         25        0.25        1.25
                                      . |      9,875       98.75      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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