Frequencies for first 10,000 rows of drug3cl3 variable in nhamcsed2004 dataset :

        drug class #3 for medication #3 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          2        0.02        0.02
repl/regs of electrolytes/water balance |          1        0.01        0.03
                     topical analgesics |          1        0.01        0.04
                        anticonvulsants |         16        0.16        0.20
                cycloplegics/mydriatics |          4        0.04        0.24
ocular anti-infective/anti-inflammatory |          2        0.02        0.26
                           antipyretics |         47        0.47        0.73
         antiasthmatics/bronchodilators |          5        0.05        0.78
                         antihistamines |        134        1.34        2.12
                          cold remedies |          2        0.02        2.14
                          surgical aids |         44        0.44        2.58
                                      . |      9,742       97.42      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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