Frequencies for first 10,000 rows of drug3cl3 variable in nhamcsed2003 dataset :

        drug class #3 for medication #3 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
repl/regs of electrolytes/water balance |          3        0.03        0.04
                        anticonvulsants |         22        0.22        0.26
                cycloplegics/mydriatics |          3        0.03        0.29
ocular anti-infective/anti-inflammatory |          7        0.07        0.36
              miscellaneous ophthalmics |          6        0.06        0.42
                           antipyretics |         45        0.45        0.87
         antiasthmatics/bronchodilators |          3        0.03        0.90
   antitussives/expectorants/mucolytics |          1        0.01        0.91
                         antihistamines |        107        1.07        1.98
                          cold remedies |          6        0.06        2.04
                                      . |      9,796       97.96      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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