Frequencies for first 10,000 rows of drug6cl3 variable in nhamcsopd2004 dataset :

        drug class #3 for medication #6 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          3        0.03        0.03
                          immune serums |          1        0.01        0.04
                        anticonvulsants |          3        0.03        0.07
                cycloplegics/mydriatics |          2        0.02        0.09
                           antipyretics |         30        0.30        0.39
         antiasthmatics/bronchodilators |          3        0.03        0.42
                         antihistamines |          7        0.07        0.49
                          surgical aids |          1        0.01        0.50
                                      . |      9,950       99.50      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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