Frequencies for first 10,000 rows of drug3cl3 variable in nhamcsed2005 dataset :

          ndc code #3 for medication #3 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
repl/regs of electrolytes/water balance |          3        0.03        0.03
                        anticonvulsants |          9        0.09        0.12
                cycloplegics/mydriatics |          3        0.03        0.15
              miscellaneous ophthalmics |          1        0.01        0.16
                   otic, topical (misc) |          1        0.01        0.17
                                  nsaid |          2        0.02        0.19
                           antipyretics |         33        0.33        0.52
                          antimalarials |          1        0.01        0.53
         antiasthmatics/bronchodilators |          3        0.03        0.56
   antitussives/expectorants/mucolytics |          1        0.01        0.57
                         antihistamines |        111        1.11        1.68
                          cold remedies |          7        0.07        1.75
                          surgical aids |         58        0.58        2.33
                                      . |      9,767       97.67      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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