Frequencies for first 10,000 rows of drug5cl3 variable in nhamcsopd2004 dataset :

        drug class #3 for medication #5 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          2        0.02        0.02
                        anticonvulsants |          8        0.08        0.10
                cycloplegics/mydriatics |          2        0.02        0.12
              miscellaneous ophthalmics |          1        0.01        0.13
       vertigo/motion sickness/vomiting |          1        0.01        0.14
                           antipyretics |         42        0.42        0.56
                          antimalarials |          1        0.01        0.57
         antiasthmatics/bronchodilators |          1        0.01        0.58
                         antihistamines |          3        0.03        0.61
                          surgical aids |          6        0.06        0.67
                                      . |      9,933       99.33      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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