Frequencies for first 10,000 rows of drug4cl3 variable in nhamcsopd2003 dataset :

        drug class #3 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
                        anticonvulsants |          3        0.03        0.04
                cycloplegics/mydriatics |          1        0.01        0.05
ocular anti-infective/anti-inflammatory |          1        0.01        0.06
                   otic, topical (misc) |          1        0.01        0.07
                           antipyretics |         40        0.40        0.47
                          antimalarials |          1        0.01        0.48
         antiasthmatics/bronchodilators |          6        0.06        0.54
                         antihistamines |          9        0.09        0.63
                                      . |      9,937       99.37      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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