Frequencies for first 10,000 rows of drug2cl3 variable in nhamcsed2003 dataset :

        drug class #3 for medication #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          2        0.02        0.02
                          immune serums |          1        0.01        0.03
                     topical analgesics |          2        0.02        0.05
                        anticonvulsants |         43        0.43        0.48
                cycloplegics/mydriatics |          5        0.05        0.53
ocular anti-infective/anti-inflammatory |          8        0.08        0.61
                           antipyretics |         76        0.76        1.37
         antiasthmatics/bronchodilators |         11        0.11        1.48
                         antihistamines |        359        3.59        5.07
                          cold remedies |         12        0.12        5.19
                                      . |      9,481       94.81      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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